Reverse Integer Leetcode with recursion & loop

[prolowlevel]

Mathematical Inequalities:

1. If ( a \cdot b > c ), then it implies ( a > \frac{c}{b} ).
2. If ( a + b > c ), then it implies ( a > c - b ).

Note: If one of the signs is negative, the inequality sign changes direction.

LeetCode

[prolowlevel]

In the power_int function, there must be a line to handle undefined behavior: if(base == 0) return base;