Learn all about C++ Power Function pow()

Syntax of C++ Power

Here, we are considering b = base and e = exponent.

We should also note here that if any argument is of long double type, then the return type is also promoted to long double. If it does not happen, the return type is promoted to double.

Parameter of C++ Power

The pow() function has basically two parameters:

b - base - It is the base, whose power is to be calculated.

e - exponent - It is the exponent to the base.

Return of C++ Power

When the pow() function is used then it returns the following as its output:

•  the base 'b' raised to the power of exponent 'e'.
• 1.0 if the exponent is zero
• 0.0 if the base is zero

Example - 1:

Now we are going to see a simple example when both base and exponent are of integer type in C++.

Output:

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Example - 2:

In this example, we will see an example when the base is of float type and the exponent is of integer type.

Output:

Example - 3:

This is the last example of pow() function. In this example, we are going to see a simple example when both base and exponent are of float type.

Output:

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Working of the pow() Function With Integers in C++

In C++, the pow() function is responsible for taking ‘double’ as the arguments of the program and returns a ‘double’ value as the output of the program. This function does not continuously work for integers. For instance, the power of (4,2) i.e. pow(4, 2). When we assign an integer, it outputs 16 on some of the compilers and also works fine with some other compilers. But pow(4, 2) without any assignment to an integer outputs 16 and works very accurately. 

• This is because 16 could also be stored as 15.9999999 or 16.0000000001 because the return type is double. When it is assigned to int, 16.0000000001 will become 16, but 15.9999999 will give output 15.
• To overcome this problem and give output the accurate answer in integer format, we can add 1e-9 or 0.000000001 to the result and typecast it to int. For example: (int)(pow(4, 2)+1e-9) will give the correct answer(16, in the above given example), irrespective of the compiler of your particular device.

Example:

In this last example of the pow() function, we are going to see how the pow() function work with integers in C++:

Output:

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Conclusion

In this article on  C++ power, we have illustrated almost all the ways by which we can implement the power function, i.e., pov() in C++, with proper examples. We have provided a brief overview of syntax, parameters and programs in C++ programming language. After the overview, we have also illustrated the Working of pow() function with integers in C++ with an example for a better understanding of the topic. We hope that this article gave you a thorough knowledge of  C++ power and how we can use it in our software development projects.

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