How can i write a program in c++ to execute prime numbers

Answer 1

#include<iostream.h>
#include<conio.h>
int main()
{
int n,i,c;
cout<<""Enter Number"<<endl;;
cin>>n;
for(i=1;i<=n;i++)
{
if(n%i==0)
{
c++;
}
}
if(c==2)
{
cout<<n<<"is a prime number";
}
else
cout<<n<<"is a composite number;
}

Please leave a like i typed the whole program and its very inconvinient to type in the answer dialog box.

Answer 2

You need a loop to check if a number is divisible by any number smaller than it.
You should come up with your own code and take this as a challenge, but if you want a little help here is my version in c++ https://code.sololearn.com/cPWk2Rg5q1de

You can also optimize the code by only checking for divisors up to the square root of the number, but that would be harder and unnecessary for small numbers

Answer 3

thnk u