CPP

Finding square root without using sqrt function?

// Online C++ compiler to run C++ program online
#include <iostream>
using namespace std;
double SqrtNumber (double num){
double temp = 0; 
double sqrt=num/2; 
while(sqrt!=temp) 
{ 
temp=sqrt; 
sqrt=(num/sqrt+sqrt)/2; 
}
}
int main() {
  cout <<SqrtNumber(4);

    return 0;
}

Finding square root without using sqrt function?

#include<iostream>
using namespace std;
double SqrtNumber (double num){
    if(num<=0){
    return 0;
    }
    int counter = ceil(num/2);
for(int i=2;i<=counter;i++){
if(i*i == num){
return i;
}
}
return 0;
}