Question

用C语言编写一个简单加减乘除的程序

程序自动出题，且数据是随机的……如果使用者输入答案错误两次，则程序给出正确答案

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
main()
{
int a,b,c,d,result,i;
char f[]={'+','-','*','/'};
while(1)
{
srand(time(NULL));
a=rand()%100;
b=rand()%100;
c=rand()%4;
switch (c)
{
case 0: d=a+b;break;
case 1: d=a-b;break;
case 2: d=a*b;break;
case 3: d=a/b;break;
}
printf("输入结果：%d%c%d=",a,f[c],b);
i=0;
while (i<2)
{
scanf("%d",&result);
if (result==d&&i<2)
{printf("你答对了^_^\n"); break; }
else i++,printf("你答错了%d次：",i);
if (i==2) {printf("\n答案：%d\n",d);}
}
}
}

Answer 2

#include
<stdio.h>
#include
<stdlib.h>
#include
<time.h>
main()
{
int
a,b,c,d,result,i;
char
f[]={'+','-','*','/'};
while(1)
{
srand(time(NULL));
a=rand()%100;
b=rand()%100;
c=rand()%4;
switch
(c)
{
case
0:
d=a+b;break;
case
1:
d=a-b;break;
case
2:
d=a*b;break;
case
3:
d=a/b;break;
}
printf("输入结果：%d%c%d=",a,f[c],b);
i=0;
while
(i<2)
{
scanf("%d",&result);
if
(result==d&&i<2)
{printf("你答对了^_^\n");
break;
}
else
i++,printf("你答错了%d次：",i);
if
(i==2)
{printf("\n答案：%d\n",d);}
}
}
}

Answer 3

#include
<stdio.h>
#include
<stdlib.h>
#include
<time.h>
main()
{
int
a,b,c,d,result,i;
char
f[]={'+','-','*','/'};
while(1)
{
srand(time(NULL));
a=rand()%100;
b=rand()%100;
c=rand()%4;
switch
(c)
{
case
0:
d=a+b;break;
case
1:
d=a-b;break;
case
2:
d=a*b;break;
case
3:
d=a/b;break;
}
printf("输入结果：%d%c%d=",a,f[c],b);
i=0;
while
(i<2)
{
scanf("%d",&result);
if
(result==d&&i<2)
{printf("你答对了^_^\n");
break;
}
else
i++,printf("你答错了%d次：",i);
if
(i==2)
{printf("\n答案：%d\n",d);}
}
}
}