Raising a number to a power p is the same as multiplying n by itself p times. Write a function called power that takes two arguments, a double value for n and an int value for p, and return the result as double value. Use default argument of 2 for p, so that if this argument is omitted the number will be squared. Write the main function that gets value from the user to test power function.
Source Code
#include<iostream>
using namespace std;
double power(double,int=2);
int main()
{
int p;
double n,r;
cout << "Enter number : ";
cin >> n;
cout << "Enter exponent : ";
cin >> p;
r = power(n,p);
cout << "Result is " << r;
r = power(n);
cout << "\nResult without passing exponent is " << r;
return 0;
}
double power(double a, int b)
{
double x = 1;
for(int i = 1; i <= b; i++)
x = x * a;
return x;
}
Output
Enter number : 5 Enter exponent : 4 Result is 625 Result without passing exponent is 25