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A C++ program to calculate the power of any number using a function

eg:1:-eg:2:-

#include <iostream>
double power(double n,int p);
using namespace std;
int main ()
{
        double num,pwr;
        int p;
        cout<<"Input the number: "<<endl;
        cin>>num;
        cout<<"Input the power: "<<endl;
        cin>>p;
        pwr=power(num,p);
        cout<<"The answer is "<<pwr<<endl;
        return 0;
}

double power(double n,int p)
{
        double pwr=1;
        int i=1;
        while(i<=p)
        {
               i++;
               pwr=pwr*n;//The number should be multiplied by itself p times
        }
        return pwr;

}