将用户输入的字母进行大小写转换

#include <stdio.h>int main(){char ch;scanf("%c",&ch);if (ch >= 'A' && ch <= 'Z')ch = ch + 32;else if (ch >= 'a' && ch <= 'z')ch = ch -32;//或者ch = (ch >= 'A' && ch <= 'Z') ? (ch + 32) : ch;printf("%c\n", ch);return 0;}