【程序91】
題目：時間函數(shù)舉例1
1.程序分析：
2.程序源代碼：
#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*/
}
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【程序92】
題目：時間函數(shù)舉例2
1.程序分析：　　　　　　　　　　　
2.程序源代碼：
/*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(“1111111111n”);}
end=time(NULL);
printf(“1: The different is %6.3fn”,difftime(end,start));
}
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【程序93】
題目：時間函數(shù)舉例3
1.程序分析：
2.程序源代碼：
/*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(“1111111111n”);}
end=clock();
printf(“1: The different is %6.3fn”,(double)(end-start));
}

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【程序94】
題目：時間函數(shù)舉例4,一個猜數(shù)游戲，判斷一個人反應(yīng)快慢。（版主初學(xué)時編的）
1.程序分析：
2.程序源代碼：
#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 secondsn”,var=(double)(end-start)/18.2);
printf(“1: it took you %6.3f secondsnn”,difftime(b,a));
if(var<15)
printf(“11 You are very clever! 11nn”);
else if(var<25)
printf(“11 you are normal! 11nn”);
else
printf(“11 you are stupid! 11nn”);
printf(“11 Congradulations 11nn”);
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;
}

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【程序95】
題目：家庭財務(wù)管理小程序
1.程序分析：
2.程序源代碼：
/*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%fn”,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 %6.1fn”,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);
}}}
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【程序96】
題目：計算字符串中子串出現(xiàn)的次數(shù)
1.程序分析：
2.程序源代碼：
#include “string.h”
#include “stdio.h”
main()
{ char str1[20],str2[20],*p1,*p2;
int sum=0;
printf(“please input two stringsn”);
scanf(“%s%s”,str1,str2);
p1=str1;p2=str2;
while(*p1!=’