#include
#include "genlib.h"
//#include
#include "simpio.h"
bool GetYesOrNo(string answer);
void PlayOneGame(void);
   
bool GetYesOrNo(string ans)
{
    while (1)  {
        ans = GetLine();
        if (StringEqual(ans,"yes"))  {
            return TRUE;            }
        else if(StringEqual(ans,"no")) {
            return FALSE;             }
      
        else{      
            printf("Please answer yes or no.\n");
      
            }
    }
}
int main()
{
    while (1)  {
            printf("...play the game...\n");
        if(!GetYesOrNo("Would you like to play again? "))break;
         }
   
    return 0;
}


这个Would you like to play again句子显示不出来，哪里有问题？

标准c里没有布尔变量