Answers for "3. Write a program that prompts the user to input a positive integer. It should then output a message indicating whether the number is a prime number. Examples of prime numbers are: 2, 3, 5, 7, 11, 15, 17 . . ."

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program to know if a number is prime

#include<bits/stdc++.h>
using namespace std;
bool Is_Prime(long long x){
	if(x%2==0)return false;
	for(int i=3;i*i<=x;i+=2)
		if(x%i==0)return false;
	return true;
}
int main(){
	long long x;
	cin>>x;
	if(Is_Prime(x))cout<<"Is Prime";
	else cout<<"Is not Prime";
}
Posted by: Guest on April-30-2020

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