How can I remove the last comma from a loop in C++ in a simple way?

Question

This program is for printing prime numbers till the input given and separating every prime number with a comma.

void main(){

    int N, counter=0, isPrime;
         


        

Answer 1

With minimal changes to your existing code:

#include 
#include 

using namespace std;

void main()
{
    int N, counter = 0, isPrime;
    string separator = ""; // none at first
    int k, j;

    cout << "Enter maximum range: ";

    cin >> N;

    for(j = 2; j <= N; j++)
    {

        isPrime = 0;
        k = 2;

        while(k

Explanation
Basically, I added a separator string which is blank at the start, i.e. the empty string, but is set to a comma for each output after the first. As such the cout statement will not print a comma before the first number, but will do so for each subsequent number being printed.