**Check Prime Number using function**

**Check Prime Number using function**

Write a C++ Program to Check Prime Number using function. C++ program to find prime number. Here’s simple C++ Program to Check Prime Number using function in C++ Programming Language.

*What are Functions ?*

*What are Functions ?*

Function is a block of statements that performs some operations. All C++ programs have at least one function – function called “main()”. This function is entry-point of your program.

A function **declaration** tells the compiler about a function’s name, return type, and parameters. A function **definition** provides the actual body of the function.

**Defining a Function : :**

**Defining a Function : :**

The general form of a C++ function definition is as follows:

return_type Function_Name( list of parameters )

{

//function’s body

}

**return_type :**suggests what the function will return. It can be void, int, char, some pointer or even a class object.**Function_Name :**is the name of the function, using the function name it is called.**Parameters :**are variables to hold values of arguments passed while function is called. A function may or may not contain parameter list.**Function body :**is he part where the code statements are written.

Below is the source code for C++ Program to Check Prime Number using function which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C++ Program to Check Prime Number using function */ #include <iostream> using namespace std; int checkPrimeNumber(int); int main() { int n; cout << "\nEnter any positive integer :: "; cin >> n; if(checkPrimeNumber(n) == 0) cout <<"\nThe Number [ "<< n << " ] is a prime number.\n"; else cout <<"\nThe Number [ "<< n << " ] is not a prime number.\n"; return 0; } int checkPrimeNumber(int n) { bool flag = false; for(int i = 2; i <= n/2; ++i) { if(n%i == 0) { flag = true; break; } } return flag; }

**OUTPUT : :**

**OUTPUT : :**

/* C++ Program to Check Prime Number using function */ Enter any positive integer :: 297 The Number [ 297 ] is not a prime number. Process returned 0

Above is the source code for C++ Program to Check Prime Number using function which is successfully compiled and run on Windows System.The Output of the program is shown above .

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