C++ Program to Check Prime Number using function

By | 27.12.2016

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 ?


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 : :


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 : :


/*  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 : :


/*  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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About Tunde A

My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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