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#include<stdio.h>
#include<stdlib.h>
void main()
{
 
  char i;
  int t;
 for(t=0;i!='x';t++)
  {i=getchar();
  if(i=='x') exit(1);
  switch(i)
{
case 'y': printf("YES\n");break;
case 'n': printf("NO\n");break;

case '\n': printf("\n");break;
//case 'x': exit(0);
  default: printf("error\n");

}

 }

}

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C/C++ code:

#include<stdio.h>
#include<stdlib.h>

void main()
{
char i;
int t;
i = 'n'; //i³õʼ»¯
for(t=0;i!='x';t++) {
i=getchar();
fflush(stdin); //Çå¿Õ¼üÅÌ»º³åÇø
if(i=='x')
exit(1);
switch(i) {
case 'y': printf("YES\n");break;
case 'n': printf("NO\n");break;
case '\n': printf("\n");break;
//case 'x': exit(0);
default: printf("error\n");