cout the unique values on console stored in single variable

I am new in C++. This is my program, which is generating a random number from 1 to 270:

#include <iostream>
#include <ctime>
#include <cstdlib>

void myFuncB(int par)
{
    std::cout << "unique = " << par; //print the unique number      
}

void myFuncA()
{   
    int paremeter = 0;
    std::cout << "Random numbers generated between 1 and 270:" << "\n";
    for(int i = 0; i < 270; i++)
    {
        paremeter = rand() % 270;
        std::cout << "paremeter=" << paremeter << "\n";
        // myFuncB(paremeter);
    }    
}

int main() {
    srand(time(0));  // Initialize random number generator.
    myFuncA();
    return 0; 
}

I want myFuncB(int par) to print the unique values only, not repeating any int value.

How can I do this without using a data structure like an array?