C++ Program to Find Power of a Number

C++ program to find power | In this post, we will develop a C++ program to calculate the power of a number. First, we will develop a program using for loop then we will use the recursion technique, and finally we will use function overloading.

Power of any number b*n given as b*b*…..*b (n-times). Here b is called base and n is called the exponent. Here we will write the C program to find the power of a number.

Example:-

2² = 2*2 = 4
3³ = 3*3*3 = 27
5³ = 5*5*5 = 125

C++ Program to Find Power of a Number Using For Loop

// C++ program to calculate power of a Number
#include<iostream>
using namespace std;
int main()
{
  // declare variables
  int base, exponent;
  long result=1;

  // take input
  cout << "Enter base and exponent: ";
  cin >> base >> exponent;

  // calculate power value
  for (int i = exponent; i >= 1; i--)
  {
    result *= base;
  }

  // display result
  cout << "Result = " << result << endl;

  return 0;
}

Output:-

Enter base and exponent: 5 4
Result = 625

Using pow() Function

We can also use pow() function to calculate the power of a number in C++.

// C++ program to calculate power of a Number
#include<iostream>
#include
using namespace std;
int main()
{
  // declare variables
  int base, exponent;
  long result;

  // take input
  cout << "Enter base and exponent: ";
  cin >> base >> exponent;

  // calculate power value
  result = pow(base, exponent);

  // display result
  cout << "Result = " << result << endl;

  return 0;
}

C++ Program to Find Power of a Number Using Recursion

We can also use recursion technique to calculate the power of a number. In recursion technique, we are defining a recursive function.

A technique of defining the method/function that contains a call to itself is called the recursion.  The recursive function/method allows us to divide the complex problem into identical single simple cases that can be handled easily. This is also a well-known computer programming technique: divide and conquer.

#include<iostream>
#include
using namespace std;

// function declaration
long power(int, int);

// main function
int main()
{
  // declare variables
  int base, exponent;
  long result;

  // take input
  cout << "Enter base and exponent: ";
  cin >> base >> exponent;

  // calculate power value
  result = power(base, exponent);

  // display result
  cout << "Result = " << result << endl;

  return 0;
}

// function to calculate power
long power(int a, int b)
{
  if(b==0)
     return 1; //base case
  else
     return a * power(a, --b); //general case
}

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