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Maths Functions

Maths Functions

Learn how C++ uses the cmath library to perform functions like square root, power, and trigonometry.

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C++ math library

The C++ math library is actually inherited from the C standard library. It is easy to use and is accessed by including cmath.

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#include <cmath>

Now that we have the cmath library, let’s use some neat functionality.

Square root

To compute the square root of a number, write sqrt followed by the number whose square root you want to calculate inside round brackets. If you write this with the cout statement, the result will be displayed on the screen. This is shown in the playground given below:

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C++
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
    float myFloat = 7.4; 
    cout << "The square root of " << myFloat << " is: " << sqrt(myFloat) << endl;
    return 0;
}

Powers

To compute the power of a number, write ...