C program to calculate the power of a number

Comprehensive Collection of C Programming Examples

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

To understand this example, you should understand the followingC programmingTopic:

• C programming operators

• C while and do ... while loops

The following program takes two integers (a base and an exponent) from the user and calculates the power.

For example, in2 ³in the case of

• 2is the base

• 3is the exponent

• is equivalent to 2*2*2

Using while loop to calculate power

#include <stdio.h>
int main() {
　　　　int base, exp;
　　　　long long result =　1;
　　　　printf("Enter base: ");
　　　　scanf("%d", &base);
　　　　printf("Enter exponent: ");
　　　　scanf("%d", &exp);
　　　　while (exp != 0) {
　　　　　　　　result　*= base;
　　　　　　　　--exp;
　　　　}
　　　　printf("Power = %lld", result);
　　　　return 0;
}

Output Result

Enter base:　3
Enter exponent:　4
Power =　81

This technique is only valid when the exponent is a positive integer.

If you need to find the power of any real number, you can use the pow() function.

Example of using pow() function

#include <math.h>
#include <stdio.h>
int main() {
　　　　double base, exp, result;
　　　　printf("Enter base: ");
　　　　scanf("%lf", &base);
　　　　printf("Enter exponent: ");
　　　　scanf("%lf", &exp);
　　　　//Calculate Power Value
　　　　result = pow(base, exp);
　　　　printf("%.0lf",1lf^%.0lf1lf = %.0lf2lf", base, exp, result);
　　　　return 0;
}

Output Result

Enter base:　2.3
Enter exponent:　4.5
2.3^4.5　=　42.44

Comprehensive Collection of C Programming Examples