Question

write a C++ program that display a prime numbers between 1 and 100 number. Plase print the remaining primes by “dots” For gexample The output should appear like

The prime numbers between 1 and 100 are: 1, 2, 3, 5, 7, .........

Answer 1

#include <iostream>

using namespace std;

bool checkPrime(int num)
{
   int i;
   if (num <= 1) return 0;
   if (num % 2 == 0 && num > 2) return 0;
   for (i = 3; i < num / 2; i += 2)
   {
      if (num % i == 0)
         return false;
   }
   return true;
}

void primes(int n){
   cout<<"The prime numbers between 1 and "<<n<<" are: ";
   for(int i = 2;i<=n;i++){
      if(checkPrime(i)){
         cout<<i<<", ";
      }
   }
}

int main(){
   int n;
   primes(100);
   cout<<"........."<<endl;
   return 0;
}
  

The prime numbers between 1 and 100 are: 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, .........