编函数，判断给定字符序列中 ( 与 ) , [ 与 ] , { 与 } 是否配对（个数相等）。

#include "stdio.h"
bool want(){
    int x=0,y=0,z=0;
    char ch;
    do{
        ch=getchar();
        switch(ch){
            case'{':x++;
                    break;
            case'}':x--;
                    break;
            case'[':y++;
                    break;
            case']':y--;
                    break;
            case'(':z++;
                    break;
            case')':z--;
                    break;
        }        
    }while(ch!='\r'&&ch!='\n');
    if(x!=0||y!=0||z!=0){
        if(x!=0)    printf("{ is wrong!\n");
        if(y!=0)    printf("[ is wrong!\n");
        if(z!=0)    printf("( is wrong!\n");
        return false;
    }
    else
        return true;
}
void main(){
    want();
}
为什么不等于零就没有啊？！！！老师说我也没弄明白！

我晓得了～～谢谢了！！