C语言学习(9)

#include <stdio.h>
#include <string.h>
int main(){
    char s[100];
    gets(s);
    printf("原字符串:%s\n",s);
    printf("变大写字符串%s\n",strupr(s));
    printf("变小写字符串%s\n",strlwr(s));
    return 0;
}