I guess you are asking to print between two numbers (an interval). I have written a code for the same in which prime numbers between num1 and num2 are printed.
#include <iostream>
using namespace std;
void primeNumbers (int low, int high) {
while (low <= high) {
int flag = 0;
for(int i = 2; i <= low/2; i++) {
if(low % i == 0) {
flag = 1;
break;
}
}
if (flag == 0)
cout << low << " ";
low++;
}
}
int main() {
int num1 = 40, num2 = 70;
cout<<"Prime numbers between "<<num1<<" and "<<num2<<": ";
primeNumbers(num1,num2);
return 0;
}
In this code, the while loop is iterated till the value of num1 is less than that of num2. Inside the while loop, the value of a variable flag is set 0 and it is checked if num1 is a prime number. If num1 is not found to be a prime number, the flag value is set to 1 and num1 is not primted. Otherwise it is printed.
After that, the num1 value is incremented by 1 and the whole process is repeated till num1 is less than num2.