reverseString.txt

// 反转字符串
char* reverseString(char* s) {
    int len=strlen(s);
    int mid=len/2;
    for(int i=0,j=len-1;i<mid,i<j;i++,j--){
        char tmp;
        tmp=s[i];
        s[i]=s[j];
        s[j]=tmp;
    }
    return s;
}