Q:

# C++ program to display prime numbers

In this program, we will read the value of N (range of the numbers) and print the all prime numbers from 2 to N.

To check prime numbers, we are creating a user defined function isPrime() that will take an integer number and return 1 if number is prime and 0 if number is not prime.

## Program to display prime numbers in C++

``````#include <iostream>
using namespace std;

//function to check prime numbers
int isPrime(int num);

int main()
{
int i;
int n; //to store, maximum range

cout<<"Enter maximum range (n): ";
cin>>n;

//print prime numbers from 2 to n
cout<<"Prime numbers:"<<endl;
for(i=2;i<n;i++)
{
if(isPrime(i))
cout<<i<<" ";
}
cout<<endl;

return 0;
}

//function definition
int isPrime(int num)
{
int cnt;
int prime=1;

for(cnt=2;cnt<=(num/2);cnt++)
{
if(num%cnt==0)
{
prime=0;
break;
}
}
return prime;
}``````

Output

```Enter maximum range (n): 100
Prime numbers:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97```