![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
运行以下, 输入 ABba , 输出 什么 ? # include < stdio.h > main() { char str [80]; int i; gets(str); for(i = 0; str[i] !='\0'; i++) if(str[i] <='Z' && str[i] >= 'A') str[i] = 'a' + str[i] - 'A'; else if(str[i] <='z' && str[i] >= 'a') str[i] = 'A' + str[i] - 'a'; puts( str ); }