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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