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📄 经典C源程序100例.txt

📁 一百个经典c语言程序
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【程序87】 
题目:回答结果(结构体变量传递) 
1.程序分析:      
2.程序源代码: 
#include "stdio.h" 
struct student 
{ int x; 
char c; 
} a; 
main() 
{a.x=3; 
a.c='a'; 
f(a); 
printf("%d,%c",a.x,a.c); 
} 
f(struct student b) 
{ 
b.x=20; 
b.c='y'; 
} 
============================================================== 
【程序88】 
题目:读取7个数(1?50)的整数值,每读取一个值,程序打印出该值个数的*。 
1.程序分析: 
2.程序源代码: 
main() 
{int i,a,n=1; 
while(n<=7) 
{ do { 
   scanf("%d",&a); 
   }while(a<1||a>50); 
for(i=1;i<=a;i++) 
 printf("*"); 
printf("\n"); 
n++;} 
getch(); 
} 
============================================================== 
【程序89】 
题目:某个公司采用公用电话传递数据,数据是四位的整数,在传递过程中是加密的,加密规则如下: 
   每位数字都加上5,然后用和除以10的余数代替该数字,再将第一位和第四位交换,第二位和第三位交换。 
1.程序分析: 
2.程序源代码: 
main() 
{int a,i,aa[4],t; 
scanf("%d",&a); 
aa[0]=a%10; 
aa[1]=a%100/10; 
aa[2]=a%1000/100; 
aa[3]=a/1000; 
for(i=0;i<=3;i++) 
 {aa[i]+=5; 
 aa[i]%=10; 
 } 
for(i=0;i<=3/2;i++) 
 {t=aa[i]; 
 aa[i]=aa[3-i]; 
 aa[3-i]=t; 
 } 
for(i=3;i>=0;i--) 
printf("%d",aa[i]); 
} 
============================================================== 
【程序90】 
题目:专升本一题,读结果。 
1.程序分析: 
2.程序源代码: 
#include "stdio.h" 
#define M 5 
main() 
{int a[M]={1,2,3,4,5}; 
int i,j,t; 
i=0;j=M-1; 
while(i {t=*(a+i); 
*(a+i)=*(a+j); 
*(a+j)=t; 
i++;j--; 
} 
for(i=0;i printf("%d",*(a+i)); 
} 
 
 
 
2006-10-25 20:42:50    第 6 楼    
 
  我是一只鱼   
  

威望: -2
级别: 小学生
职务: 论坛版主
经验: 628 
银币: 108
发帖数: 59 篇
注册时间: 2006-09-22 23:31:00
  消息 查看 搜索 好友 修改 删除 复制 引用

--------------------------------------------------------------------------------
 

【程序91】 
题目:时间函数举例1 
1.程序分析: 
2.程序源代码: 
#include "stdio.h" 
#include "time.h" 
void main() 
{ time_t lt; /*define a longint time varible*/ 
lt=time(NULL);/*system time and date*/ 
printf(ctime(<)); /*english format output*/ 
printf(asctime(localtime(<)));/*tranfer to tm*/ 
printf(asctime(gmtime(<))); /*tranfer to Greenwich time*/ 
} 
============================================================== 
【程序92】 
题目:时间函数举例2 
1.程序分析:            
2.程序源代码: 
/*calculate time*/ 
#include "time.h" 
#include "stdio.h" 
main() 
{ time_t start,end; 
int i; 
start=time(NULL); 
for(i=0;i<3000;i++) 
{ printf("\1\1\1\1\1\1\1\1\1\1\n");} 
end=time(NULL); 
printf("\1: The different is %6.3f\n",difftime(end,start)); 
} 
============================================================== 
【程序93】 
题目:时间函数举例3 
1.程序分析: 
2.程序源代码: 
/*calculate time*/ 
#include "time.h" 
#include "stdio.h" 
main() 
{ clock_t start,end; 
int i; 
double var; 
start=clock(); 
for(i=0;i<10000;i++) 
{ printf("\1\1\1\1\1\1\1\1\1\1\n");} 
end=clock(); 
printf("\1: The different is %6.3f\n",(double)(end-start)); 
} 
============================================================== 
【程序94】 
题目:时间函数举例4,一个猜数游戏,判断一个人反应快慢。(版主初学时编的) 
1.程序分析: 
2.程序源代码: 
#include "time.h" 
#include "stdlib.h" 
#include "stdio.h" 
main() 
{char c; 
clock_t start,end; 
time_t a,b; 
double var; 
int i,guess; 
srand(time(NULL)); 
printf("do you want to play it.('y' or 'n') \n"); 
loop: 
while((c=getchar())=='y') 
{ 
i=rand()%100; 
printf("\nplease input number you guess:\n"); 
start=clock(); 
a=time(NULL); 
scanf("%d",&guess); 
while(guess!=i) 
{if(guess>i) 
{printf("please input a little smaller.\n"); 
scanf("%d",&guess);} 
else 
{printf("please input a little bigger.\n"); 
scanf("%d",&guess);} 
} 
end=clock(); 
b=time(NULL); 
printf("\1: It took you %6.3f seconds\n",var=(double)(end-start)/18.2); 
printf("\1: it took you %6.3f seconds\n\n",difftime(b,a)); 
if(var<15) 
printf("\1\1 You are very clever! \1\1\n\n"); 
else if(var<25) 
printf("\1\1 you are normal! \1\1\n\n"); 
else 
printf("\1\1 you are stupid! \1\1\n\n"); 
printf("\1\1 Congradulations \1\1\n\n"); 
printf("The number you guess is %d",i); 
} 
printf("\ndo you want to try it again?(\"yy\".or.\"n\")\n"); 
if((c=getch())=='y') 
goto loop; 
} 
============================================================== 

 
 
 
2006-10-25 20:44:31    第 7 楼    
 
  我是一只鱼   
  

威望: -2
级别: 小学生
职务: 论坛版主
经验: 628 
银币: 108
发帖数: 59 篇
注册时间: 2006-09-22 23:31:00
  消息 查看 搜索 好友 修改 删除 复制 引用

--------------------------------------------------------------------------------
 

============================================================== 
【程序95】 
题目:家庭财务管理小程序 
1.程序分析: 
2.程序源代码: 
/*money management system*/ 
#include "stdio.h" 
#include "dos.h" 
main() 
{ 
FILE *fp; 
struct date d; 
float sum,chm=0.0; 
int len,i,j=0; 
int c; 
char ch[4]="",ch1[16]="",chtime[12]="",chshop[16],chmoney[8]; 
pp: clrscr(); 
sum=0.0; 
gotoxy(1,1);printf("|---------------------------------------------------------------------------|"); 
gotoxy(1,2);printf("| money management system(C1.0) 2000.03 |"); 
gotoxy(1,3);printf("|---------------------------------------------------------------------------|"); 
gotoxy(1,4);printf("| -- money records -- | -- today cost list -- |"); 


作者: zhlei81  2005-1-22 11:33   回复此发言   

________________________________________
18 回复:经典C源程序100例 
gotoxy(1,5);printf("| ------------------------ |-------------------------------------|"); 
gotoxy(1,6);printf("| date: -------------- | |"); 
gotoxy(1,7);printf("| | | | |"); 
gotoxy(1,8);printf("| -------------- | |"); 
gotoxy(1,9);printf("| thgs: ------------------ | |"); 
gotoxy(1,10);printf("| | | | |"); 
gotoxy(1,11);printf("| ------------------ | |"); 
gotoxy(1,12);printf("| cost: ---------- | |"); 
gotoxy(1,13);printf("| | | | |"); 
gotoxy(1,14);printf("| ---------- | |"); 
gotoxy(1,15);printf("| | |"); 
gotoxy(1,16);printf("| | |"); 
gotoxy(1,17);printf("| | |"); 
gotoxy(1,18);printf("| | |"); 
gotoxy(1,19);printf("| | |"); 
gotoxy(1,20);printf("| | |"); 
gotoxy(1,21);printf("| | |"); 
gotoxy(1,22);printf("| | |"); 
gotoxy(1,23);printf("|---------------------------------------------------------------------------|"); 
i=0; 
getdate(&d); 
sprintf(chtime,"%4d.%02d.%02d",d.da_year,d.da_mon,d.da_day); 
for(;;) 
{ 
gotoxy(3,24);printf(" Tab __browse cost list Esc __quit"); 
gotoxy(13,10);printf(" "); 
gotoxy(13,13);printf(" "); 
gotoxy(13,7);printf("%s",chtime); 
j=18; 
ch[0]=getch(); 
if(ch[0]==27) 
break; 
strcpy(chshop,""); 
strcpy(chmoney,""); 
if(ch[0]==9) 
{ 
mm:i=0; 
fp=fopen("home.dat","r+"); 
gotoxy(3,24);printf(" "); 
gotoxy(6,4);printf(" list records "); 
gotoxy(1,5);printf("|-------------------------------------|"); 
gotoxy(41,4);printf(" "); 
gotoxy(41,5);printf(" |"); 
while(fscanf(fp,"%10s%14s%f\n",chtime,chshop,&chm)!=EOF) 
{ if(i==36) 
{ getch(); 
i=0;} 
if ((i%36)<17) 
{ gotoxy(4,6+i); 
printf(" "); 
gotoxy(4,6+i);} 
else 
if((i%36)>16) 
{ gotoxy(41,4+i-17); 
printf(" "); 
gotoxy(42,4+i-17);} 
i++; 
sum=sum+chm; 
printf("%10s %-14s %6.1f\n",chtime,chshop,chm);} 
gotoxy(1,23);printf("|---------------------------------------------------------------------------|"); 
gotoxy(1,24);printf("| |"); 
gotoxy(1,25);printf("|---------------------------------------------------------------------------|"); 
gotoxy(10,24);printf("total is %8.1f$",sum); 
fclose(fp); 
gotoxy(49,24);printf("press any key to.....");getch();goto pp; 
} 
else 
{ 
while(ch[0]!='\r') 
{ if(j<10) 
{ strncat(chtime,ch,1); 
j++;} 
if(ch[0]==8) 
{ 
len=strlen(chtime)-1; 
if(j>15) 
{ len=len+1; j=11;} 
strcpy(ch1,""); 
j=j-2; 
strncat(ch1,chtime,len); 
strcpy(chtime,""); 
strncat(chtime,ch1,len-1); 
gotoxy(13,7);printf(" ");} 
gotoxy(13,7);printf("%s",chtime);ch[0]=getch(); 
if(ch[0]==9) 
goto mm; 
if(ch[0]==27) 
exit(1); 
} 
gotoxy(3,24);printf(" "); 
gotoxy(13,10); 
j=0; 
ch[0]=getch(); 
while(ch[0]!='\r') 
{ if (j<14) 
{ strncat(chshop,ch,1); 
j++;} 
if(ch[0]==8) 
{ len=strlen(chshop)-1; 
strcpy(ch1,""); 
j=j-2; 
strncat(ch1,chshop,len); 
strcpy(chshop,""); 
strncat(chshop,ch1,len-1); 
gotoxy(13,10);printf(" ");} 
gotoxy(13,10);printf("%s",chshop);ch[0]=getch();} 
gotoxy(13,13); 
j=0; 
ch[0]=getch(); 
while(ch[0]!='\r') 
{ if (j<6) 
{ strncat(chmoney,ch,1); 
j++;} 
if(ch[0]==8) 
{ len=strlen(chmoney)-1; 
strcpy(ch1,""); 
j=j-2; 
strncat(ch1,chmoney,len); 
strcpy(chmoney,""); 
strncat(chmoney,ch1,len-1); 
gotoxy(13,13);printf(" ");} 
gotoxy(13,13);printf("%s",chmoney);ch[0]=getch();} 
if((strlen(chshop)==0)||(strlen(chmoney)==0)) 
continue; 
if((fp=fopen("home.dat","a+"))!=NULL); 
fprintf(fp,"%10s%14s%6s",chtime,chshop,chmoney); 
fputc('\n',fp); 
fclose(fp); 
i++; 
gotoxy(41,5+i); 
printf("%10s %-14s %-6s",chtime,chshop,chmoney); 
}}}  
============================================================== 



 
 
 
2006-10-25 20:48:45    第 8 楼    
 
  我是一只鱼   
  

威望: -2
级别: 小学生
职务: 论坛版主
经验: 628 
银币: 108
发帖数: 59 篇
注册时间: 2006-09-22 23:31:00
  消息 查看 搜索 好友 修改 删除 复制 引用

--------------------------------------------------------------------------------
 

【程序96】 
题目:计算字符串中子串出现的次数 
1.程序分析: 
2.程序源代码: 
#include "string.h" 
#include "stdio.h" 
main() 
{ char str1[20],str2[20],*p1,*p2; 
int sum=0; 
printf("please input two strings\n"); 
scanf("%s%s",str1,str2); 
p1=str1;p2=str2; 
while(*p1!='\0') 
{ 
if(*p1==*p2) 
{while(*p1==*p2&&*p2!='\0') 
{p1++; 
p2++;} 
} 
else 
p1++; 
if(*p2=='\0') 
sum++; 
p2=str2; 
} 
printf("%d",sum); 
getch();}  
============================================================== 
【程序97】 
题目:从键盘输入一些字符,逐个把它们送到磁盘上去,直到输入一个#为止。 
1.程序分析:      
2.程序源代码: 
#include "stdio.h" 
main() 
{ FILE *fp; 
char ch,filename[10]; 
scanf("%s",filename); 
if((fp=fopen(filename,"w"))==NULL) 
{printf("cannot open file\n"); 
exit(0);} 
ch=getchar(); 
ch=getchar(); 
while(ch!='#') 
{fputc(ch,fp);putchar(ch); 
ch=getchar(); 
} 
fclose(fp); 
} 
============================================================== 
【程序98】 
题目:从键盘输入一个字符串,将小写字母全部转换成大写字母,然后输出到一个磁盘文件“test”中保存。 
   输入的字符串以!结束。  
1.程序分析: 
2.程序源代码: 
#include "stdio.h" 
main() 
{FILE *fp; 
char str[100],filename[10]; 
int i=0; 
if((fp=fopen("test","w"))==NULL) 
{ printf("cannot open the file\n"); 
exit(0);} 
printf("please input a string:\n"); 
gets(str); 
while(str!='!') 
{ if(str>='a'&&str<='z') 
str=str-32; 
fputc(str,fp); 
i++;} 
fclose(fp); 
fp=fopen("test","r"); 
fgets(str,strlen(str)+1,fp); 
printf("%s\n",str); 
fclose(fp); 
} 


作者: zhlei81  2005-1-22 11:33   回复此发言   

________________________________________
19 回复:经典C源程序100例 
【程序99】 
题目:有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列),  
输出到一个新文件C中. 
1.程序分析: 
2.程序源代码: 
#include "stdio.h" 
main() 
{ FILE *fp; 
int i,j,n,ni; 
char c[160],t,ch; 
if((fp=fopen("A","r"))==NULL) 
{printf("file A cannot be opened\n"); 
exit(0);} 
printf("\n A contents are :\n"); 

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