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C Program to Calculate the Power of a Number

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

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To understand this example, you should have the knowledge of the following C programming topics:


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

For example: In the case of 23

  • 2 is the base number
  • 3 is the exponent
  • And, the power is equal to 2*2*2

Power of a Number Using the while Loop

#include int main() { int base, exp; long long result = 1; printf("Enter a base number: "); scanf("%d", &base); printf("Enter an exponent: "); scanf("%d", &exp); while (exp != 0) { result *= base; --exp; } printf("Answer = %lld", result); return 0; }

Output

Enter a base number: 3
Enter an exponent: 4
Answer = 81

The above technique works only if the exponent is a positive integer.

If you need to find the power of a number with any real number as an exponent, you can use the pow() function.


Power Using pow() Function

#include #include int main() { double base, exp, result; printf("Enter a base number: "); scanf("%lf", &base); printf("Enter an exponent: "); scanf("%lf", &exp); // calculates the power result = pow(base, exp); printf("%.1lf^%.1lf = %.2lf", base, exp, result); return 0; }

Output

Enter a base number: 2.3
Enter an exponent: 4.5
2.3^4.5 = 42.44
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