Table of Contents

## Introduction

In this program, you will learn to calculate the power of a number.

The user will be asked to enter an integer as the base value and the power value, which will be the exponent of the base number.

For example, 9 raised to power 3 means **9 ^{3}= 9*9*9=721**, where 9 is the base value and 3 is the exponent.

To understand the program, you should know about

1. Operators

2. while and do-while loop

## Program

#include<iostream> using namespace std; int main() { float b; // b is base number cout<<"Enter the base value: "; cin>>b; int p; // p is the power or exponent cout<<"Enter the value of exponent: "; cin>>p; float result=1; while(p!=0) //condition { result=result*b; p--; } cout<<"Result: "<<result; return 0; }

## Output

## Explanation

‘b’ is the variable for the base number, and ‘p’ is the power of the base number.

**float result=1;**

To store the final result variable, ‘result’ is initialized with 1.

**while(p!=0) **

If the above condition gives a true result, then the body of the while loop is executed.

Since ‘p’ is 3 thus, the condition becomes true, and the value of the base entered by the user is 8 therefore,

**result=result*b;** it will assign 1*8 i.e., result=8

**p–; **‘p’ gets decremented to 2

the condition becomes true for p=2 thus,

**result=result*b;** it will assign 8*8 i.e., result=64

**p–; **‘p’ gets decremented to 1

the condition becomes true for p=1 thus,

**result=result*b;** it will assign 64*8 i.e., result=512

**p–; **‘p’ gets decremented to 0

the condition becomes false for p=0 thus,

the final result is 512

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