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C++ Program to Check Prime or Not



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Check Prime or Not in C++

To check whether the number is a prime number or not a prime number in C++ programming, you have to ask to the user to enter a number and start checking for prime number. If number is divisible by 2 to one less than that number (n-1), then the number is not prime number, otherwise it will be a prime number.

C++ Programming Code to Check Prime or Not

Following C++ program ask the user to enter a number to check whether it is a prime number or not, then display it on the screen:

C++ Programming Example Output:
/* C++ Program - Check Prime or Not */
		
#include<iostream.h>
#include<conio.h>
void main()
{
	clrscr();
	int num,i,count=0;
	cout<<"Enter a number:";
	cin>>num;
	for(i=2;i<num;i++)
	{
		if(num%i==0)
		{
			count++;
			break;
		}
	}
	if(count==0)
	{
		cout<<"This is a prime number";
	}
	else
	{
		cout<<"This is not a prime number";
	}
	getch();
}

When the above C++ program is compile and executed, it will produce the following result. Above C++ Programming Example Output (for prime number):

C++ program check prime number

Above C++ Programming Example Output (for not prime number):

prime number program c++ programming

Same Program in Other Language

You may like the same program in other programming languages:


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