把字符串中的小写字母转换成大写字母

#include <string.h>
#include <stdio.h>

void UpperCase(char str[])
{
	int i=0;
	int len = strlen(str);
	for(i=0; i<len; i++)
		if(str[i] >= 'a' && str[i] <= 'z')
			str[i] -= ('a'-'A');
}

int main(void)
{
	char str[] = "aBcDeF";
	
	printf("length of the string \"aBcDeF\" = %d\n", sizeof(str)/sizeof(str[0]));
	
	UpperCase(str);
	
	printf("%s\n",str);

	return 0;
}

/*
length of the string "aBcDeF" = 7
ABCDEF
请按任意键继续. . .
*/