Have you ever wondered how mathematical calculations involving exponents are handled in the C programming language? One of the key functions used for this purpose is the pow() function, which is part of the math.h header file. Let’s understand more!
The Power Function is used to raise a number to the power of another number. In C Programming, this functionality is provided through the <math.h> header file and can be accessed using the pow function.
Must Read Power Function in C++ & Power Function in Java
Table of Content
Syntax for the pow() function
double pow(double base, double exponent);
Where,
- base is the number to be raised.
- exponent is the power to which the base number is raised.
Example of Power Function in C
#include <stdio.h>#include <math.h>
int main() { double base = 3.0; double exponent = 4.0; double result = pow(base, exponent); printf("Result: %.2f\n", result); return 0;}
Output
Result: 81.00
In the code above, the base (3.0) is raised to the power of the exponent (4.0), and the result (81.00) is printed to the console. Note that the header file needs to be included in order to use the pow function, and the header file is required to use the printf function for output. The %.2f in the printf function is a format specifier that instructs the function to print the floating-point number with two decimal places.
Examples on Power Function in C
Basic Level
Example 1
Calculating the square of a number
#include <stdio.h>#include <math.h>
int main() { double num = 4.0; double result = pow(num, 2.0); printf("The square of %.2f is: %.2f\n", num, result); return 0;}
Output
The square of 4.00 is: 16.00
Example 2
Calculating the cube of a number
#include <stdio.h>#include <math.h>
int main() { double num = 3.0; double result = pow(num, 3.0); printf("The cube of %.2f is: %.2f\n", num, result); return 0;}
Output
The cube of 3.00 is: 27.00
Intermediate Level
Example 3
Calculating the Square Root Using Power Function
#include <stdio.h>#include <math.h>
int main() { double num = 16.0; double result = pow(num, 0.5); printf("The square root of %.2f is: %.2f\n", num, result); return 0;}
Output
The square root of 16.00 is: 4.00
Example 4
Calculating the Nth Root of a Number
#include <stdio.h>#include <math.h>
int main() { double num = 27.0; double n = 3.0; double result = pow(num, 1.0/n); printf("The %.2f-th root of %.2f is: %.2f\n", n, num, result); return 0;}
Output
The 3.00-th root of 27.00 is: 3.00
Miscellaneous Example
Example 5
Calculating Compound Interest
The formula for calculating compound interest over time is given by:
Where:
- A: the money accumulated after n years, including interest.
- P: the principal amount (the initial amount of money)
- r: annual interest rate (decimal)
- n: the number of times that interest is compounded per year
- t: the time in years
#include <stdio.h>#include <math.h>
int main() { double P = 1000.0; // Initial amount of money double r = 0.05; // Annual interest rate in decimal form (5%) int n = 4; // Interest is compounded quarterly int t = 10; // Time in years
double A = P * pow((1 + r/n), (n*t)); printf("The amount accumulated after %d years is: %.2f\n", t, A); return 0;}
Output
The amount accumulated after 10 years is: 1643.62
Finally, we printed the accumulated amount after the specified number of years.
Conclusion
The Power Function in C allows developers to compute exponential values with ease. Throughout this blog, we’ve demonstrated its utility in various scenarios, from simple numeric operations to complex calculations.
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I'm Esha Gupta, a B.Tech graduate in Computer Science & Engineering, specializing in Front End Web Dev. I've interned at GeeksforGeeks & Coding Minutes, fueling my passion for crafting appealing and functional digit... Read Full Bio
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