We introduce a sub-cell WENO reconstruction method to evaluate spatial derivatives in the high-order ADER scheme. The basic idea in our reconstruction is to use only r stencils to reconstruct the point-wise values of solutions and spatial derivatives for the 2r-1 th order ADER scheme in one dimension, while in two dimensions, the dimension-by-dimension sub-cell reconstruction approach for spatial derivatives is employed. Compared with the original ADER scheme of Toro and Titarev (2002) [2] that uses the direct derivatives of reconstructed polynomials for solutions to evaluate spatial derivatives, our method not only reduces greatly the computational costs of the ADER scheme on a given mesh, but also avoids possible numerical oscillations near discontinuities, as demonstrated by a Number of one- and two-dimensional numerical tests. All these tests show that the 5th-order ADER scheme based on our sub-cell reconstruction method achieves the desired accuracy, and is essentially non-oscillatory and computationally cheaper for problems with discontinuities.
标签： 高精度格式
上传时间： 2016-01-13
上传用户：ccsdcczd
Computes all eigenvalues and eigenvectors of a real symmetric matrix a, ! which is of size n by n, stored in a physical np by np array. ! On output, elements of a above the diagonal are destroyed. ! d returns the eigenvalues of a in its first n elements. ! v is a matrix with the same logical and physical dimensions as a, ! whose columns contain, on output, the normalized eigenvectors of a. ! nrot returns the Number of Jacobi rotations that were required. ! Please notice that the eigenvalues are not ordered on output. ! If the sorting is desired, the addintioal routine "eigsrt" ! can be invoked to reorder the output of jacobi.
上传时间： 2016-06-04
上传用户：1512313
Fire and Fury。 This article is about the 2018 book. For other uses, see Fire and Fury (disambiguation). The title refers to a quote by Trump about the conflict with North Korea. The book became a New York Times Number one bestseller.Fire and Fury: Inside the Trump White House is a 2018 book by Michael Wolff which details the behavior of U.S. President Donald Trump and the staff of his 2016 presidential campaign and White House. The book highlights descriptions of Trump's behavior, chaotic interactions among senior White House staff, and derogatory comments about the Trump family by former White House Chief StrategistSteve Bannon. Trump is depicted as being held in low regard by his White House staff, leading Wolff to state that "100% of the people around him" believe Trump is unfit for office.[1] Reviewers generally accepted Wolff's portrait of a dysfunctional Trump administration, but were skeptical of many of the book's most controversial claims.
上传时间： 2018-02-26
上传用户：Yoobaobao
This article is about the 2018 book. For other uses, see Fire and Fury (disambiguation). The title refers to a quote by Trump abot the conflict with North Korea. The book became a New York Times Number one bestseller.Fire and Fury: Inside the Trump White House is a 2018 book by Michael Wolff which details the behavior of U.S. President Donald Trump and the staff of his 2016 presidential campaign and White House. The book highlights descriptions of Trump's behavior, chaotic interactions among senior White House staff, and derogatory comments about the Trump family by former White House Chief StrategistSteve Bannon. Trump is depicted as being held in low regard by his White House staff, leading Wolff to state that "100% of the people around him" believe Trump is unfit for office.[1] Reviewers generally accepted Wolff's portrait of a dysfunctional Trump administration, but were skeptical of many of the book's most controversial claims.
上传时间： 2018-02-26
上传用户：Yoobaobao
#include<stdio.h> #include<string.h> #include<stdlib.h> #define N 100 int iNumOfStu=0; struct score { float math; float english; float computer; }; struct student { int Number; char name[20]; struct score sco; float average; }; struct student stu[N]; void print_menu(void);//输出菜单 void choosemenu(void);//菜单选择 void input_student1(int);//输入学生信息 void input_student2(void);//输入总函数 void input_student3(int &,int);//判断学号是否重复 void input_student4(int,int);//覆盖原信息 void sort_student3(student s[],int);//按照英语成绩排序 void sort_student4(student s[],int);//按照计算机成绩排序 void sort_student2(student s[],int);//按照数学成绩排序 void sort_student5(student s[],int);//按照平均成绩排序 float input_score2(int);//计算学生平均成绩 void print_student2(void);//显示表头 void print_student3(int);//显示学生信息 void print_student1(int);//显示全部学生资料 void sort_student1(void);//排序总函数 void menu(void);//菜单调度总函数 int search_student2(int);//按学号查询学生信息并输出 void search_student3(int);//按平均分最高查询并输出 void search_student1(void);//查询总函数 void delete_student2(int,int);//删除学生信息 void delete_student1(void);//删除总函数 void change_student2(int);//修改学生资料 void change_student1(void);//修改总函数 void input_score3(int);//统计成绩 void input_score1(void);//统计成绩总函数 void print_help(void);//输出帮助信息 void exit_student(void);//退出系统 void save_student(student *,int);//保存学生信息 void main() { menu(); } void save_student(student *s,int a)//保存学生信息 { FILE *fp; if((fp=fopen("d:\\学生信息.txt","wb"))==NULL) { printf("不能打开文件！\n"); } else { printf("保存信息到D盘\n"); fprintf(fp,"本班所有学生具体信息如下：\r\n"); fprintf(fp," 学号 姓名 数学成绩 英语成绩 计算机成绩 平均成绩\r\n"); for(int i=0;i<a;i++) { fprintf(fp,"%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[i].Number,stu[i].name,stu[i].sco.math,stu[i].sco.english,stu[i].sco.computer,stu[i].average); fprintf(fp,"\r\n"); } fclose(fp); printf("信息保存成功！\n"); } } void exit_student(void)//退出系统 { exit(1); } void print_help(void)//输出帮助信息 { printf("本系统所能容纳的最大学生数为%d人\n学生信息保存在D盘根目录下，保存文件为“学生信息.txt”。\n感谢使用！\n",N); } void input_score1(void)//统计成绩总函数 { int c; c=search_student2(iNumOfStu); printf("学号：%d\n",stu[c].Number); printf("姓名：%s\n",stu[c].name); input_score3(c); printf("新成绩录入成功！\n"); stu[c].average=input_score2(c); } void input_score3(int a)//统计成绩 { printf("数学新成绩："); scanf("%f",&stu[a].sco.math); printf("英语新成绩："); scanf("%f",&stu[a].sco.english); printf("计算机新成绩："); scanf("%f",&stu[a].sco.computer); } void change_student2(int a)//修改学生资料 { printf("学号：%d----修改为：",stu[a].Number); scanf("%d",&stu[a].Number); getchar(); printf("姓名：%s----修改为：",stu[a].name); gets(stu[a].name); printf("数学成绩：%.2f----修改为：",stu[a].sco.math); scanf("%f",&stu[a].sco.math); printf("英语成绩：%.2f----修改为：",stu[a].sco.english); scanf("%f",&stu[a].sco.english); printf("计算机成绩：%.2f----修改为：",stu[a].sco.computer); scanf("%f",&stu[a].sco.computer); } void change_student1(void)//修改总函数 { int c; c=search_student2(iNumOfStu); getchar(); printf("是否要修改此学生信息？（“y”代表是）"); char d; scanf("%c",&d); if(d=='y'||d=='Y') { change_student2(c); stu[c].average=input_score2(c); printf("信息修改成功！\n"); } } void delete_student1(void)//删除总函数 { int c; c=search_student2(iNumOfStu); getchar(); printf("是否删除此条记录？（“y”代表是）"); char d; scanf("%c",&d); if(d=='y'||d=='Y') { delete_student2(c,iNumOfStu); printf("记录已删除！\n"); } } void delete_student2(int a,int b)//删除学生信息 { for(int i=a;i<b-1;i++) { stu[i]=stu[i+1]; } --iNumOfStu; } void search_student1(void)//查询总函数 { printf("1、按学号查询\n2、按平均分最高查询\n请选择："); int c; scanf("%d",&c); switch(c) { case 1: { search_student2(iNumOfStu); break; } case 2: { search_student3(iNumOfStu); break; } default: break; } } void menu(void)//菜单调度总函数 { print_menu(); choosemenu(); } void sort_student1(void)//排序总函数 { printf("1、按数学成绩排序\n2、按英语成绩排序\n3、按计算机成绩排序\n4、按平均成绩排序\n请选择："); int c; scanf("%d",&c); switch(c) { case 1: { sort_student2(stu,iNumOfStu); break; } case 2: { sort_student3(stu,iNumOfStu); break; } case 3: { sort_student4(stu,iNumOfStu); break; } case 4: { sort_student5(stu,iNumOfStu); break; } default: break; } } void print_student1(int a)//显示全部学生资料 { printf("本班所有学生具体信息如下\n"); print_student2(); for(int i=0;i<a;i++) { print_student3(i); } } void print_student3(int a)//显示学生信息 { printf("%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[a].Number,stu[a].name,stu[a].sco.math,stu[a].sco.english,stu[a].sco.computer,stu[a].average); } void print_student2(void)//显示表头 { printf(" 学号 姓名 数学成绩 英语成绩 计算机成绩 平均成绩\n"); } void input_student4(int a,int b)//覆盖原信息 { stu[a]=stu[b-1]; --iNumOfStu; } void input_student3(int &a,int b)//判断学号是否重复 { if(a!=0) { int i=0; do { if(stu[a].Number==stu[i].Number) { printf("此学号代表的学生已录入\n1、覆盖原信息\n2、重新输入\n请选择："); int c; scanf("%d",&c); switch(c) { case 1: { input_student4(i,iNumOfStu); a=iNumOfStu-1; printf("信息已替换！\n"); break; } case 2: { printf("请重新输入学生信息：\n"); input_student1(iNumOfStu-1); break; } default: break; } break; } ++i; } while(i<b-1); } } void print_menu(void)//输出菜单 { printf("======欢迎来到学生信息管理系统======\n"); printf(" 1、输入学生资料\n"); printf(" 2、删除学生资料\n"); printf(" 3、查询学生资料\n"); printf(" 4、修改学生资料\n"); printf(" 5、显示学生资料\n"); printf(" 6、统计学生成绩\n"); printf(" 7、排序学生成绩\n"); printf(" 8、保存学生资料\n"); printf(" 9、获取帮助信息\n"); printf(" 10、退出系统\n"); printf("====================================\n"); printf("请选择："); } void input_student2(void)//输入总函数 { char end; printf("请输入学生信息（在最后一个学生信息录入完成后以“/”结束录入）：\n"); for(int i=0;(end=getchar())!='/';i++) { input_student1(i); ++iNumOfStu; input_student3(i,iNumOfStu); } for(int j=0;j<iNumOfStu;j++) { stu[j].average=input_score2(j); } } void input_student1(int a)//输入学生信息 { printf("学号："); scanf("%d",&stu[a].Number); getchar(); printf("姓名："); gets(stu[a].name); printf("数学成绩："); scanf("%f",&stu[a].sco.math); printf("英语成绩："); scanf("%f",&stu[a].sco.english); printf("计算机成绩："); scanf("%f",&stu[a].sco.computer); } float input_score2(int a)//计算学生平均成绩 { return (stu[a].sco.math+stu[a].sco.english+stu[a].sco.computer)/3; } void search_student3(int a)//按平均分最高查询并输出 { int max=0; for(int i=0;i<a;i++) { if(stu[max].average<stu[i].average) { max=i; } } print_student2(); print_student3(max); } void sort_student2(student s[],int a)//按照数学成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].sco.math>stu[max].sco.math) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } void sort_student3(student s[],int a)//按照英语成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].sco.english>stu[max].sco.english) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } void sort_student4(student s[],int a)//按照计算机成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].sco.computer>stu[max].sco.computer) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } void sort_student5(student s[],int a)//按照平均成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].average>stu[max].average) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } int search_student2(int a)//按照学号查找学生并输出 { int num; int c; printf("请输入要查询的学号："); scanf("%d",&num); for(int i=0;i<a;i++) { if(num==stu[i].Number) { c=i; } } printf("此学生的信息是：\n"); print_student2(); print_student3(c); return c; } void choosemenu(void)//菜单选择 { int i; scanf("%d",&i); switch(i) { case 1: { input_student2(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 2: { delete_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 3: { search_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 4: { change_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 5: { print_student1(iNumOfStu); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 6: { input_score1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 7: { sort_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 8: { save_student(stu,iNumOfStu); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 9: { print_help(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 10: { exit_student(); } default: break; } } 运行结果： 源文件下载地址： http://115.com/file/clnq138g#一个简单的学生成绩管理系统.rar （请将此地址复制到浏览器地址栏中访问下载页面）
标签： 成绩查询系统
上传时间： 2019-06-08
上传用户：啊的撒旦
#include<stdio.h> #include<string.h> #include<stdlib.h> #define N 100 int iNumOfStu=0; struct score { float math; float english; float computer; }; struct student { int Number; char name[20]; struct score sco; float average; }; struct student stu[N]; void print_menu(void);//输出菜单 void choosemenu(void);//菜单选择 void input_student1(int);//输入学生信息 void input_student2(void);//输入总函数 void input_student3(int &,int);//判断学号是否重复 void input_student4(int,int);//覆盖原信息 void sort_student3(student s[],int);//按照英语成绩排序 void sort_student4(student s[],int);//按照计算机成绩排序 void sort_student2(student s[],int);//按照数学成绩排序 void sort_student5(student s[],int);//按照平均成绩排序 float input_score2(int);//计算学生平均成绩 void print_student2(void);//显示表头 void print_student3(int);//显示学生信息 void print_student1(int);//显示全部学生资料 void sort_student1(void);//排序总函数 void menu(void);//菜单调度总函数 int search_student2(int);//按学号查询学生信息并输出 void search_student3(int);//按平均分最高查询并输出 void search_student1(void);//查询总函数 void delete_student2(int,int);//删除学生信息 void delete_student1(void);//删除总函数 void change_student2(int);//修改学生资料 void change_student1(void);//修改总函数 void input_score3(int);//统计成绩 void input_score1(void);//统计成绩总函数 void print_help(void);//输出帮助信息 void exit_student(void);//退出系统 void save_student(student *,int);//保存学生信息 void main() { menu(); } void save_student(student *s,int a)//保存学生信息 { FILE *fp; if((fp=fopen("d:\\学生信息.txt","wb"))==NULL) { printf("不能打开文件！\n"); } else { printf("保存信息到D盘\n"); fprintf(fp,"本班所有学生具体信息如下：\r\n"); fprintf(fp," 学号 姓名 数学成绩 英语成绩 计算机成绩 平均成绩\r\n"); for(int i=0;i<a;i++) { fprintf(fp,"%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[i].Number,stu[i].name,stu[i].sco.math,stu[i].sco.english,stu[i].sco.computer,stu[i].average); fprintf(fp,"\r\n"); } fclose(fp); printf("信息保存成功！\n"); } } void exit_student(void)//退出系统 { exit(1); } void print_help(void)//输出帮助信息 { printf("本系统所能容纳的最大学生数为%d人\n学生信息保存在D盘根目录下，保存文件为“学生信息.txt”。\n感谢使用！\n",N); } void input_score1(void)//统计成绩总函数 { int c; c=search_student2(iNumOfStu); printf("学号：%d\n",stu[c].Number); printf("姓名：%s\n",stu[c].name); input_score3(c); printf("新成绩录入成功！\n"); stu[c].average=input_score2(c); } void input_score3(int a)//统计成绩 { printf("数学新成绩："); scanf("%f",&stu[a].sco.math); printf("英语新成绩："); scanf("%f",&stu[a].sco.english); printf("计算机新成绩："); scanf("%f",&stu[a].sco.computer); } void change_student2(int a)//修改学生资料 { printf("学号：%d----修改为：",stu[a].Number); scanf("%d",&stu[a].Number); getchar(); printf("姓名：%s----修改为：",stu[a].name); gets(stu[a].name); printf("数学成绩：%.2f----修改为：",stu[a].sco.math); scanf("%f",&stu[a].sco.math); printf("英语成绩：%.2f----修改为：",stu[a].sco.english); scanf("%f",&stu[a].sco.english); printf("计算机成绩：%.2f----修改为：",stu[a].sco.computer); scanf("%f",&stu[a].sco.computer); } void change_student1(void)//修改总函数 { int c; c=search_student2(iNumOfStu); getchar(); printf("是否要修改此学生信息？（“y”代表是）"); char d; scanf("%c",&d); if(d=='y'||d=='Y') { change_student2(c); stu[c].average=input_score2(c); printf("信息修改成功！\n"); } } void delete_student1(void)//删除总函数 { int c; c=search_student2(iNumOfStu); getchar(); printf("是否删除此条记录？（“y”代表是）"); char d; scanf("%c",&d); if(d=='y'||d=='Y') { delete_student2(c,iNumOfStu); printf("记录已删除！\n"); } } void delete_student2(int a,int b)//删除学生信息 { for(int i=a;i<b-1;i++) { stu[i]=stu[i+1]; } --iNumOfStu; } void search_student1(void)//查询总函数 { printf("1、按学号查询\n2、按平均分最高查询\n请选择："); int c; scanf("%d",&c); switch(c) { case 1: { search_student2(iNumOfStu); break; } case 2: { search_student3(iNumOfStu); break; } default: break; } } void menu(void)//菜单调度总函数 { print_menu(); choosemenu(); } void sort_student1(void)//排序总函数 { printf("1、按数学成绩排序\n2、按英语成绩排序\n3、按计算机成绩排序\n4、按平均成绩排序\n请选择："); int c; scanf("%d",&c); switch(c) { case 1: { sort_student2(stu,iNumOfStu); break; } case 2: { sort_student3(stu,iNumOfStu); break; } case 3: { sort_student4(stu,iNumOfStu); break; } case 4: { sort_student5(stu,iNumOfStu); break; } default: break; } } void print_student1(int a)//显示全部学生资料 { printf("本班所有学生具体信息如下\n"); print_student2(); for(int i=0;i<a;i++) { print_student3(i); } } void print_student3(int a)//显示学生信息 { printf("%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[a].Number,stu[a].name,stu[a].sco.math,stu[a].sco.english,stu[a].sco.computer,stu[a].average); } void print_student2(void)//显示表头 { printf(" 学号 姓名 数学成绩 英语成绩 计算机成绩 平均成绩\n"); } void input_student4(int a,int b)//覆盖原信息 { stu[a]=stu[b-1]; --iNumOfStu; } void input_student3(int &a,int b)//判断学号是否重复 { if(a!=0) { int i=0; do { if(stu[a].Number==stu[i].Number) { printf("此学号代表的学生已录入\n1、覆盖原信息\n2、重新输入\n请选择："); int c; scanf("%d",&c); switch(c) { case 1: { input_student4(i,iNumOfStu); a=iNumOfStu-1; printf("信息已替换！\n"); break; } case 2: { printf("请重新输入学生信息：\n"); input_student1(iNumOfStu-1); break; } default: break; } break; } ++i; } while(i<b-1); } } void print_menu(void)//输出菜单 { printf("======欢迎来到学生信息管理系统======\n"); printf(" 1、输入学生资料\n"); printf(" 2、删除学生资料\n"); printf(" 3、查询学生资料\n"); printf(" 4、修改学生资料\n"); printf(" 5、显示学生资料\n"); printf(" 6、统计学生成绩\n"); printf(" 7、排序学生成绩\n"); printf(" 8、保存学生资料\n"); printf(" 9、获取帮助信息\n"); printf(" 10、退出系统\n"); printf("====================================\n"); printf("请选择："); } void input_student2(void)//输入总函数 { char end; printf("请输入学生信息（在最后一个学生信息录入完成后以“/”结束录入）：\n"); for(int i=0;(end=getchar())!='/';i++) { input_student1(i); ++iNumOfStu; input_student3(i,iNumOfStu); } for(int j=0;j<iNumOfStu;j++) { stu[j].average=input_score2(j); } } void input_student1(int a)//输入学生信息 { printf("学号："); scanf("%d",&stu[a].Number); getchar(); printf("姓名："); gets(stu[a].name); printf("数学成绩："); scanf("%f",&stu[a].sco.math); printf("英语成绩："); scanf("%f",&stu[a].sco.english); printf("计算机成绩："); scanf("%f",&stu[a].sco.computer); } float input_score2(int a)//计算学生平均成绩 { return (stu[a].sco.math+stu[a].sco.english+stu[a].sco.computer)/3; } void search_student3(int a)//按平均分最高查询并输出 { int max=0; for(int i=0;i<a;i++) { if(stu[max].average<stu[i].average) { max=i; } } print_student2(); print_student3(max); } void sort_student2(student s[],int a)//按照数学成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].sco.math>stu[max].sco.math) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } void sort_student3(student s[],int a)//按照英语成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].sco.english>stu[max].sco.english) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } void sort_student4(student s[],int a)//按照计算机成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].sco.computer>stu[max].sco.computer) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } void sort_student5(student s[],int a)//按照平均成绩排序 { struct student temp; for(int i=0;i<a-1;i++) { int max=i; for(int j=i+1;j<a;j++) if(stu[j].average>stu[max].average) { max=j; } if(max!=i) { temp=stu[max]; stu[max]=stu[i]; stu[i]=temp; } } print_student2(); for(int k=0;k<a;k++) { print_student3(k); } } int search_student2(int a)//按照学号查找学生并输出 { int num; int c; printf("请输入要查询的学号："); scanf("%d",&num); for(int i=0;i<a;i++) { if(num==stu[i].Number) { c=i; } } printf("此学生的信息是：\n"); print_student2(); print_student3(c); return c; } void choosemenu(void)//菜单选择 { int i; scanf("%d",&i); switch(i) { case 1: { input_student2(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 2: { delete_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 3: { search_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 4: { change_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 5: { print_student1(iNumOfStu); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 6: { input_score1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 7: { sort_student1(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 8: { save_student(stu,iNumOfStu); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 9: { print_help(); printf("按回车键返回主菜单"); getchar(); getchar(); menu(); break; } case 10: { exit_student(); } default: break; } } 运行结果： 源文件下载地址： http://115.com/file/clnq138g#一个简单的学生成绩管理系统.rar （请将此地址复制到浏览器地址栏中访问下载页面） #include<stdio.h> #include<string.h> #include<stdlib.h> #define N 100 int iNumOfStu=0; struct score { float math; float english; float computer; }; struct student { int Number; char name[20]; struct score sco; float average; }; struct student stu[N]; void print_menu(void);//输出菜单 void choosemenu(void);//菜单选择 void input_student1(int);//输入学生信息 void input_student2(void);//输入总函数 void input_student3(int &,int);//判断学号是否重复 void input_student4(int,int);//覆盖原信息 void sort_student3(student s[],int);//按照英语成绩排序 void sort_student4(student s[],int);//按照计算机成绩排序 void sort_student2(student s[],int);//按照数学成绩排序 void sort_student5(student s[],int);//按照平均成绩排序 float input_score2(int);//计算学生平均成绩 void print_student2(void);//显示表头 void print_student3(int);//显示学生信息 void print_student1(int);//显示全部学生资料 void sort_student1(void);//排序总函数 void menu(void);//菜单调度总函数 int search_student2(int);//按学号查询学生信息并输出 void search_student3(int);//按平均分最高查询并输出 void search_student1(void);//查询总函数 void delete_student2(int,int);//删除学生信息 void delete_student1(void);//删除总函数 void change_student2(int);//修改学生资料 void change_student1(void);//修改总函数 void input_score3(int);//统计成绩 void input_score1(void);//统计成绩总函数 void print_help(void);//输出帮助信息 void exit_student(void);//退出系统 void save_student(student *,int);//保存学生信息 void main() { menu(); } void save_student(student *s,int a)//保存学生信息 { FILE *fp; if((fp=fopen("d:\\学生信息.txt","wb"))==NULL) { printf("不能打开文件！\n"); } else { printf("保存信息到D盘\n"); fprintf(fp,"本班所有学生具体信息如下：\r\n"); fprintf(fp," 学号 姓名 数学成绩 英语成绩 计算机成绩 平均成绩\r\n"); for(int i=0;i<a;i++) { fprintf(fp,"%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[i].Number,stu[i].name,stu[i].sco.math,stu[i].sco.english,stu[i].sco.computer,stu[i].average); fprintf(fp,"\r\n"); } fclose(fp); printf("信息保存成功！\n"); } } void exit_student(void)//退出系统 { exit(1); } void print_help(void)//输出帮助信息 { printf("本系统所能容纳的最大学生数为%d人\n学生信息保存在D盘根目录下，保存文件为“学生信息.txt”。\n感谢使用！\n",N); } void input_score1(void)//统计成绩总函数 { int c; c=search_student2(iNumOfStu); printf("学号：%d\n",stu[c].Number); printf("姓名：%s\n",stu[c].name); input_score3(c); printf("新成绩录入成功！
标签： c语言
上传时间： 2019-06-09
上传用户：啊的撒旦
Abstract—In the future communication applications, users may obtain their messages that have different importance levels distributively from several available sources, such as distributed storage or even devices belonging to other users. This scenario is the best modeled by the multilevel diversity coding systems (MDCS). To achieve perfect (information-theoretic) secrecy against wiretap channels, this paper investigates the fundamental limits on the secure rate region of the asymmetric MDCS (AMDCS), which include the symmetric case as a special case. Threshold perfect secrecy is added to the AMDCS model. The eavesdropper may have access to any one but not more than one subset of the channels but know nothing about the sources, as long as the size of the subset is not above the security level. The question of whether superposition (source separation) coding is optimal for such an AMDCS with threshold perfect secrecy is answered. A class of secure AMDCS (S-AMDCS) with an arbitrary Number of encoders is solved, and it is shown that linear codes are optimal for this class of instances. However, in contrast with the secure symmetric MDCS, superposition is shown to be not optimal for S-AMDCS in general. In addition, necessary conditions on the existence of a secrecy key are determined as a design guideline.
标签： Fundamental Limits Secure Class on of
上传时间： 2020-01-04
上传用户：kddlas
The world population is continuously growing and reached a significant evolution of the society, where the Number of people living in cities surpassed the Number of people in rural areas.
标签： Building Future Cities Smart
上传时间： 2020-05-23
上传用户：shancjb
Two important microwave remote sensors are the radar and the radiometer. There have been a Number of books written on various aspects of radar, but there have been only a few written on microwave radiometers, especially on sub- jects of how to design and build radiometer systems. This book, which is the second edition of a book originally published in 1989, attempts to fill this void.
标签： Radiometer Microwave Systems
上传时间： 2020-05-23
上传用户：shancjb
Two important microwave remote sensors are the radar and the radiometer. There have been a Number of books written on various aspects of radar, but there have been only a few written on microwave radiometers, especially on sub- jects of how to design and build radiometer systems. This book, which is the second edition of a book originally published in 1989, attempts to fill this void.
标签： Radiometer Microwave Analysis Systems Design
上传时间： 2020-05-26
上传用户：shancjb
