LeetCode 7

Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

/*************************************************************************
    > File Name: LeetCode007.c
    > Author: Juntaran 
    > Mail: Jacinthmail@gmail.com
    > Created Time: 2016年04月24日 星期日 17时03分19秒
 ************************************************************************/

/*************************************************************************

    Reverse Integer
    
    Reverse digits of an integer.

    Example1: x = 123, return 321
    Example2: x = -123, return -321

 ************************************************************************/
 
#include <stdio.h>
#include <limits.h>

int reverse(int x){

    long int result = 0;

    /* 取出数字 */
    int p = x>0 ? x : -x;
    
    /* Reverse */
    while( p != 0 ){
        result = result*10 + p%10;
        p = p/10;
    }
    
    /* 添加符号 */
    result = (x>0) ? result : -result;
    
    /* 判断溢出 */
    if( result > INT_MAX || result < INT_MIN ){
        return 0;
    }else{
        printf("%d
",result);
        return result;
    }
}

int reverse1(int x){
    
    long result = 0;
    while(x != 0){
        result = result * 10 + x % 10;
        x = x/10;
    }
    if( result > INT_MAX || result < INT_MIN ){
        return 0;
    }
    printf("%d
",result);
    return (int)result;
}

int main(){
    int x = -15984;
    reverse(x);
    reverse1(x);
}