7. Reverse Integer

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

*Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.

*Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

 

*Example 1:

*Input: x = 123
*Output: 321
*Example 2:

*Input: x = -123
*Output: -321
*Example 3:

*Input: x = 120
*Output: 21
************************************************

class Solution {
public:
    int reverse(int x) {
        int ans=0;

     while(x!=0){
         int digit=x%10;

        if((ans>INT_MAX/10) || (ans<INT_MIN/10)){
            return 0;
        }

         ans=ans*10+digit;
         x=x/10;
     }   
     return ans;
    }
};