Custom Square Root Function in c++

C++: Square Root

#include<iostream.h>
double my_sqrt(int,int);
 
int main()
{
    int num,root; // root can be 2,3,4... 
	//root depends you want to take square , cube , 4rth , 5th , nth root of any number
	cout<<"Enter Your Value N :=:"; cin>>num; cout<<"\n";
	if(num<0){
		cout<<"Square Root of -ve entry in real Number is Not Possible\n";
	}
	else{
		cout<<"Enter The Root :=:"; cin>>root; cout<<"\n";
		double rt=my_sqrt(num,root); // calling custom function
		cout<<root<<" Root of Number "<<num<<" :=:"<<rt<<"\n";
	}
    return 0;
}
 
double my_sqrt(int Number, int Root)
{
    int j;
    double i,k=1;
    double incre = 0.01; 
	// 0.01 starting value it is the accuurate value upto 2 decimal places choose 0.01 or 0.001 or so on
	// the more the incre is lower the high the accuracy of root !
 
    for(i=1; i<=Number; i+=incre){ // Number n 
        for(j=0;j<Root;j++){ // any root 
            k*=i;
        }
        if(k>Number){ // if multipe is becoming greater  then just return its 1 less
            return (i-incre);
            break;
        }
        else
            k=1; // special case
    }
}