Please write the mind function that detects the error and returns the right outcome

#include #include #include #include using namespace std; double sqrt(double num, float epsilon=1e-7) { if(num == 0) return 0; if(num == 1) return 1; if(num::quiet_NaN(); // Assuming the sqrt of num as num only double x = num; // The closed guess will be stored in the root double root; while (1) { // Calculate more closed x root = 0.5 * (x + (num / x)); // Check for closeness if (abs(root - x)