题解 | #倒置字符串#

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


void reverse(char* left,char* right)
{
    assert(left);
    assert(right);
    while(left<right)
    {
        char tmp = * left;
        *left = *right;
        *right = tmp;
        left++;
        right--;
    }
}
int main() {
    char arr[101]={0};
    //输入
    gets(arr);//I like beijing.
    //逆置
    int len = strlen(arr);
    //逆序整个字符串
    reverse(arr,arr+len-1);
    //逆序每个单词
    char* start = arr;
    while(*start)
    {
        char * end = start;
        while(*end != ' ' && *end != '\0')
        {
            end++;
        }
        reverse(start,end-1);
        if(*end != '\0')
            end++;
        start = end;
    }
    printf("%s\n",arr);//beijing. like I

    return 0;
}




fatkun