为什么是死循环？？

Question

#include<stdio.h>
main()
{
 int x=0,y=0;
 char i='y',j='\0';
 printf("hello world!\n");
 while(i=='y') 
 {   
    
  printf("enter x and y\nx=");
  scanf("%d",&x);
  printf("y=");
  scanf("%d",&y);
  if (x==y)
   printf("x=y, no maximum.\n");
  else if (x>y)
   printf("x>y, x is the maximum.\n");
  else
   printf("x<y, y is the maximum.\n");  
  printf("enter 'y' or 'Y' to continue.\nand press others to quiet...\nyour choose is...");
  
  scanf("%c",&j);
  if (j=='y')
   i='\0'; 
  printf("\n*************************\n");
   
  
 }
 
}

为什么是死循环？？

scanf（"%c"，&j）;

怎么没有执行到？？

求解。

Answer 1

[code="java"]#include
int main()
{
int x=0,y=0;
char i='y',j='\0';
printf("hello world!\n");
while(i=='y')
{

printf("enter x and y\nx=");
scanf("%d",&x);
getchar();
printf("y=");
scanf("%d",&y);
getchar();
if (x==y)
printf("x=y, no maximum.\n");
else if (x>y)
printf("x>y, x is the maximum.\n");
else
printf("x<y, y is the maximum.\n");

printf("enter 'y' or 'Y' to continue.\nand press others to quiet...\nyour choose is...");

scanf("%c",&j);
getchar();
if (j != 'y' && j != 'Y')
i='\0';
printf("\n*************************\n");

}

}
[/code]
这样就可以了，原因是scanf过滤空格、制表符、回车，当你输入数字的时候敲了回车。getchar就读到了你最后敲的那个回车符了。