[C语言]将一个字母转换为大写

#include <stdio.h>

// 将一个字母转换为大写
#define UPCASE(ch) (((ch) >= 'a' && (ch) <= 'z') ? ((ch)-0x20) : (ch))

int main()
{
	char c = 'c';
	printf("After converting character %c to upppercase is : %c .\n",c , UPCASE(c));

	return 0;
}

输出：
After converting character c to upppercase is : C .