How do I do these questions without hardcoding and using inbuilt libraries

/** * * @param x * @param y * @return the quadrant in which coordinate (x, y) exists * quadrant 1: non-negative x, non-negative y * quadrant 2: negative x, non-negative y * quadrant 3: negative x, negative y * quadrant 4: non-negative x, negative y * */ public int getQuadrant(int x, int y) { return 0; //to be completed }

/** * * @param val (assume val is more than or equal to zero) * @return val rounded to the nearest integer. */ public int roundOff(double val) { return 0; //to be completed }