从键盘输入一个小写字母 转化为大写字母并输出。

#include <stdio.h>

void main()

{

char c1, c2;

printf("请输入一个小写字母：\n");

scanf("%c", &c1);

if (c1 >= 'a' && c1 <= 'z')

{

c2 = c1 - 32;

printf("Before change is %c\n", c1);

printf("After change is %c\n", c2);

}

else

printf("输入有误！\n");

}