Question

print first 20 prime numbers using a function name isprime().

Answer 1

#include <iostream>

using namespace std;

int main() {

int num,i,count,n,isPrime;

cout << "Enter a Number between 30 and 2000: ";

cin >> n;

count=0;

for(num = 1; count<=n; num++){

isPrime = 0;

count++;

for(i=2;i<=num/2;i++){

if(num%i==0){

isPrime++;

break;

}

}

if(isPrime==0 && num!= 1)

cout << num << endl;

}

return 0;

}