#include<stdio.h>
#include<stdlib.h>
int main(int argc,char *argv[])
{
    int brace=0,ch;
    while((ch=getchar())!=EOF)
    {
        if(ch=='{')
        {
            brace+=1;
        }
        if(ch=='}')
        {
            if(brace==0)
            {
                printf("Extra closing brace!\n");
            }
            else
            {
                brace-=1;
            }
        }
    }
    if(brace>0)
    {
        printf("%d unmatched openging braces!\n",brace);
    }
    return EXIT_SUCCESS;
}
我输入内容之后加了文件结束符（按Ctrl+z）为什么还是没输出？

谢谢了！大师的算法真犀利！