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#include <iostream>
#include <cstdlib>
#include <ctime>
 
using namespace std;
 
int main(void) {
	int maxball;
	int ballsno;
 
	cout << "Max ball number? ";
	cin >> maxball;
	cout << "How many balls? ";
	cin >> ballsno;
	srand(time(NULL));
 
    bool *array=new bool[maxball], rnd;
    for (int i=0;i<ballsno;i++)
    {
        do
        {
            rnd=rand()%max+1;
        } while (array[rnd]);
        array[rnd]=true;
        cout<<rnd;
    }
 
    delete[] array;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:22:23: error: invalid operands of types ‘int’ and ‘<unresolved overloaded function type>’ to binary ‘operator%’
             rnd=rand()%max+1;
                 ~~~~~~^~~~

Standard output is empty