C++ Programming Code Examples
C++ > Mathematics Code Examples
C++ Program to Calculate Power of a Number
/* C++ Program to Calculate Power of a Number
In this article, you will learn to compute power to a number manually, and by using pow() function.
This program takes two numbers from the user (a base number and an exponent) and calculates the power.
Power of a number = base^exponent
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 pow() function. */
#include <iostream>
using namespace std;
int main()
{
int exponent;
float base, result = 1;
cout << "Enter base and exponent respectively: ";
cin >> base >> exponent;
cout << base << "^" << exponent << " = ";
while (exponent != 0) {
result *= base;
--exponent;
}
cout << result;
return 0;
}
#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. These files are mainly imported from an outside source into the current program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. This type of preprocessor directive tells the compiler to include a file in the source code program.
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Consider a situation, when we have two persons with the same name, jhon, in the same class. Whenever we need to differentiate them definitely we would have to use some additional information along with their name, like either the area, if they live in different area or their mother's or father's name, etc. Same situation can arise in your C++ applications. For example, you might be writing some code that has a function called xyz() and there is another library available which is also having same function xyz(). Now the compiler has no way of knowing which version of xyz() function you are referring to within your code.
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Raise to power. The pow() function returns the result of the first argument raised to the power of the second argument. This function is defined in the cmath header file. pow() function is a library function of cmath header, it is used to find the raise to the power, it accepts two arguments and returns the first argument to the power of the second argument.
A program shall contain a global function named main, which is the designated start of the program in hosted environment. main() function is the entry point of any C++ program. It is the point at which execution of program is started. When a C++ program is executed, the execution control goes directly to the main() function. Every C++ program have a main() function.
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