cprogram.txt

几个C语言的经典程序

【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; 
} 
============================================================== 
【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 -- |"); 
 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); 
}}}  
============================================================== 
【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); 
} 
 【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"); 
for(i=0;(ch=fgetc(fp))!=EOF;i++) 
{c[i]=ch; 
putchar(c[i]); 
} 
fclose(fp); 
ni=i; 
if((fp=fopen("B","r"))==NULL) 
{printf("file B cannot be opened\n"); 
exit(0);} 
printf("\n B contents are :\n"); 
for(i=0;(ch=fgetc(fp))!=EOF;i++) 
{c[i]=ch; 
putchar(c[i]); 
} 
fclose(fp); 
n=i; 
for(i=0;i<n;i++) 
for(j=i+1;j<n;j++) 
if(c[i]>c[j]) 
{t=c[i];c[i]=c[j];c[j]=t;} 
printf("\n C file is:\n"); 
fp=fopen("C","w"); 
for(i=0;i<n;i++) 
{ putc(c[i],fp); 
putchar(c[i]); 
} 
fclose(fp); 
} 
============================================================== 
【程序100】 
题目:有五个学生,每个学生有3门课的成绩,从键盘输入以上数据(包括学生号,姓名,三门课成绩),计算出 
 平均成绩,况原有的数据和计算出的平均分数存放在磁盘文件"stud"中. 
1.程序分析: 
2.程序源代码: 
#include "stdio.h" 
struct student 
{ char num[6]; 
char name[8]; 
int score[3]; 
float avr; 
} stu[5]; 
main() 
{int i,j,sum; 
FILE *fp; 
/*input*/ 
for(i=0;i<5;i++) 
{ printf("\n please input No. %d score:\n",i); 
printf("stuNo:"); 
scanf("%s",stu[i].num); 
printf("name:"); 
scanf("%s",stu[i].name); 
sum=0; 
for(j=0;j<3;j++) 
{ printf("score %d.",j+1); 
scanf("%d",&stu[i].score[j]); 
sum+=stu[i].score[j]; 
} 
stu[i].avr=sum/3.0; 
} 
fp=fopen("stud","w"); 
for(i=0;i<5;i++) 
if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1) 
printf("file write error\n"); 
fclose(fp); 
}