题解 | #大小写转换#

#include <stdio.h>

int main() {
    char arr[] = {0};
    int i = 0;
    for (i = 0; i < 10; i ++) {
        arr[i] =  getchar();
        while (arr[i] != EOF) {
            if (arr[i] == 10) {
                putchar(10);  
            } else {
                putchar(arr[i] + 32);
            }
            break;
        }


    }
    return 0;
}