Question

C语言程序调试

#include "stdio.h"
#include "time.h"
#include "stdlib.h"
void main()
{
int computer,user;
char c;
srand ((unsigned)time(NULL));
printf("Starting!");
printf("Please input 1.Stone,2.Scissor,3.Paper");
scanf("%d",&user);
computer=rand()%3+1;
printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper");
switch (computer-user)
{
case 0:
printf("Draw!\n\n");
break;
case 1:
case -2:
printf("computer win!\n\n");
case -1:
case 2:
printf("You win!\n\n");
}
printf("Continue the game please press Y,press other key will exit");
getchar();
c=getchar();
}
while (c=="y"||c=="Y")
printf("It's all ready exit");
}
有五个错误，但是怎么也找不出来，望高手指点~~

Answer 1

main函数用int返回值比较好，不过也只是警告；
case 1/-2部分少了break；
缺少do，while上面的花括号没有对应的正括号；
while的判断条件char不能和字符串比较，这是指针和整型比较了，应该用单引号，如果用双引号，则判断会错误；
?:句式有问题，最后一个"paper"少一个:段，最后一个判断其实也没必要，模3得到的整数加1，只能是1/2/3，这个判断是废的。
如果补充了do，那么while后面应增加";"分号结束。

最终语法和逻辑都正确的应该是（当然其实并不够严谨，换行等排版也很难看）：
#include "stdio.h"
#include "time.h"
#include "stdlib.h"

int main()
{
int computer,user;
char c;
do
{
srand ((unsigned)time(NULL));
printf("Starting!");
printf("Please input 1.Stone,2.Scissor,3.Paper");
scanf("%d",&user);
computer=rand()%3+1;
printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper":"unknow");
switch (computer-user)
{
case 0:
printf("Draw!\n\n");
break;
case 1:
case -2:
printf("computer win!\n\n");
break;
case -1:
case 2:
printf("You win!\n\n");
}
printf("Continue the game please press Y,press other key will exit");
getchar();
c=getchar();
}
while (c=='y'||c=='Y');

printf("It's all ready exit");
return 0;
}

Answer 2

最后一个do while循环的do自己找地方放好，只是将语法错误改了
#include "stdio.h"
#include "time.h"
#include "stdlib.h"

void main()
{
int computer,user;
char c;
srand ((unsigned)time(NULL));
printf("Starting!");
printf("Please input 1.Stone,2.Scissor,3.Paper");
scanf("%d",&user);
computer=rand()%3+1;
printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper": "");
switch (computer-user)
{
case 0:
printf("Draw!\n\n");
break;
case 1:
case -2:
printf("computer win!\n\n");
case -1:
case 2:
printf("You win!\n\n");
}
do{
printf("Continue the game please press Y,press other key will exit");
getchar();
c=getchar();
}
while (c=='y'||c=='Y');
printf("It's all ready exit");
}

Answer 3

#include "stdio.h"
#include "time.h"
#include "stdlib.h"
void main()
{
int computer,user;
char c;
srand ((unsigned)time(NULL));
printf("Starting!");
printf("Please input 1.Stone,2.Scissor,3.Paper");
scanf("%d",&user);
computer=rand()%3+1;
//printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper");
//三目运算符不匹配
printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper":"");
switch (computer-user)
{
case 0:
printf("Draw!\n\n");
break;
case 1:
case -2:
printf("computer win!\n\n");
case -1:
case 2:
printf("You win!\n\n");
}
printf("Continue the game please press Y,press other key will exit");
getchar();
c=getchar();
//}多了个｝
//while (c=="y"||c=="Y")char 用''
while (c=='y'||c=='Y')
printf("It's all ready exit");
}

Answer 4

改成下面这样就正确了：
#include "stdio.h"
#include "time.h"
#include "stdlib.h"
void main()
{
int computer,user;
char c;
srand ((unsigned)time(NULL));
printf("Starting!");
printf("Please input 1.Stone,2.Scissor,3.Paper");
scanf("%d",&user);
computer=rand()%3+1;
printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":"Paper");
switch (computer-user)
{
case 0:
printf("Draw!\n\n");
break;
case 1:
case -2:
printf("computer win!\n\n");
case -1:
case 2:
printf("You win!\n\n");
}
printf("Continue the game please press Y,press other key will exit");
getchar();
c=getchar();

while (c=='y'||c=='Y')
printf("It's all ready exit");
}

Answer 5

自己看吧
#include "stdio.h"
#include "time.h"
#include "stdlib.h"
void main()
{
int computer,user;
char c;
char *p1="Stone",*p2="Scissor",*p3="Paper";
srand ((unsigned)time(NULL));
printf("Starting!");

do{
printf("Please input 1.Stone,2.Scissor,3.Paper\n");
scanf("%d",&user);
computer=rand()%3+1;
// printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper");
printf("Computer output is %s\n\n",computer==1?"Stone":computer==2?"Scissor":computer==3?"Paper":" ");
switch (computer-user)
{
case 0:
printf("Draw!\n\n");
break;
case 1:
case -2:
printf("computer win!\n\n");
case -1:
case 2:
printf("You win!\n\n");
}
printf("Continue the game please press Y,press other key will exit\n\n");
getchar();
c=getchar();

}
while (c=='y'||c=='Y');

printf("It's all ready exit");
}
// while (c=='y'||c=='Y')
// printf("It's all ready exit");
//}