What does the meaning of the pow function in C++?

In C++, the pow function is a mathematical function used to calculate the power of a number. Its full form is:

double pow(double base, double exponent);

In this case, ‘base’ represents the base number, and ‘exponent’ represents the index. The pow function returns the value of the base raised to the power of the exponent.

In fact, the pow function in C++ can calculate any number to a power, not just limited to integer exponents. When the exponent is an integer, the result of the pow function is also a floating-point number. If the exponent is a fraction or negative number, the result of the pow function will be a floating-point number, potentially with a decimal part.

An example of using the pow function is to calculate the square of a number.

#include <iostream>
#include <cmath>

int main() {
    double num = 2.5;
    double square = pow(num, 2);
    std::cout << "Square of " << num << " is: " << square << std::endl;
    return 0;
}

The output result is:

Square of 2.5 is: 6.25

In the example above, the pow function calculated the square of 2.5 and assigned the result to the variable square.