Question

Write a C++ program to accept a number and test whether it is a

Prime number.

Answer 1

In question it is mentioned that we are going to take input hence we will use cin variable

after that we have to check the entered number is prime or not therefore we know that 2 is a prime number and the numbers which are not divided by any other number except 1 is prime 

We will create a loop using for loop to check the number divisibility by previous all number using i++

for (i = 1; i <= number; i++){
 if (number % i == 0)
 {
 c++;
 } }

complete code ::

#include <iostream>
using namespace std;
int main()
{ 
 int number, i, c = 0;
 
 cout << "Enter any number number: "; cin>>number;
 for (i = 1; i <= number; i++)
 {
 if (number % i == 0)
 {
 c++;
 }
 }
 if (c == 2)
 {
 cout <<number<<"- is a Prime number" << endl;
 }
 else
 {
 cout <<number<<" - is not a Prime number" << endl; 
 }
 return 0; 
}

 

First declare header tags iostream

we used int main as we are doing operations with integers , initialize values and variables 

Comments

consider sharing these answer with your friends and ask your doubts here !!!!!