Input number and check prime or not using for loop in C++
for Loop - Question 10
In this question, we will see how to input a number and check if it is a prime number or not in C++ programming using for loop. To know more about for loop click on the for loop lesson.
Q10) Write a program in C++ to input a number and check if it is a prime number or not using for loop.
Program
#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
int i,n,fc=0;
cout<<"Enter a number ";
cin>>n;
for(i=1; i<=n; i=i+1)
{
if(n%i==0)
{
fc=fc+1; // counting the factors of the given number
}
}
if(fc==2) // a prime number has only two factors
{
cout<<"Prime Number";
}
else
{
cout<<"Not Prime Number";
}
return 0;
}Output
Enter a number 17 Prime Number
