202401-programming-assignments/【额外练习】选择结构/7-12 选择-大小写转换.c

#include <stdio.h>

int main() {
    char c;

    scanf("%c", &c);

    if (c >= 'a' && c <= 'z') {
        printf("%c\n", c - 32);
    } else if (c >= 'A' && c <= 'Z') {
        printf("%c\n", c + 32);
    }

    return 0;
}