找不到用户定义的文本运算符

win10 c语言
莫名其妙文本的“song”就找不到了

#include <stdio.h>
int main(int argc, char* argv[])
{
    int song = 0;
    while (song < 10000)
    {
        while (song < 10000)
    printf("考试:%d\n",song);
        song++;
    }
    if (song == 2){
        printf("好成绩\n");
    }
    return 0;
}