字符串逆转

头文件:

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

1、函数原型:

void inverse(char *str);

方法一:

void inverse(char *str){
    char *p1, *p2;

    char temp;

    p1 = str;
    p2 = str + strlen(str) - 1; 

    while(p1 < p2){
        temp = *p1;
        *p1 = *p2;
        *p2 = temp;
        p1++;
        p2--;
    }

}

方法二:

void inverse(char *str){
    int i, j, temp;

    i = 0;
    j = strlen(str) - 1;

    while (i < j){
        temp = str[i];
        str[i] = str[j];
        str[j] = temp;
        i++;
        --j;
    }
    
}

2、函数原型:

void inverse(char *str,char * str2);

 方法:

void inverse(char *str,char * str2){

    
    if(str == NULL)
        return;

    if(*str == '')
        return ;

    inverse(str + 1, str2);

    strncat(str2, str, 1);
}