leetcode-solutions/7.reverseInteger.cpp at master · rizwanmoha/leetcode-solutions · GitHub

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class Solution {
public:
   int reverse(int x) {
        long int num = 0;
        //2147483647
        if( x >= 2147483647 || x <= -2147483648)
            return 0;
        if(x > 0){
            while(x > 0){
                num = num * 10;
                if( num >= 2147483647 || num <= -2147483648)
                    return 0;
                num = num + (x % 10);
                x = x / 10;
            }
        }
        else{
            x = -1 * x;
            while(x > 0){
                num = num * 10;
                if( num >= 2147483647 || num <= -2147483648)
                    return 0;
                num = num + (x % 10);
                x = x / 10;
            }
            num = -1 * num;
        }
        return int(num);
    }
};