ABC292A字符串大小写转换

#include <stdio.h>
int n, m, i, j, k;
char c; 
int main(){
    while(scanf("%c", &c) == 1){
        if(c <= 32) break;
        if(c >= 97) c -= 32;//小写字母转大写
        printf("%c", c);
    }
    return 0;
}