FUnction Help

I want to create a function that makes sure the input is positive. Im not sure if i am on the right track.
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#include <iostream>
#include <string>
#include <algorithm>
#include <ctime>
using namespace std;

int main() {

	double pretty_category,so_category,ugly_category;
	cout << "How many flowers are in the Pretty Category?" << endl;
	cin >> pretty_category;
	cout << "How many flowers are in the So-So Category?" << endl;
	cin >> so_category;
	cout << "How many flowers are in the Ugly Category?" << endl;
	cin >> ugly_category;
	


	system("pause");
	return 0;
}  



void number_checker() {

	double num;

	if (num < 0) {
		cin.ignore(INT_MAX, '/n');
	}
	else {
		cin >> num;
	}

}
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bool number_positive(int number) {

	if (number < 0) {
		return false;
	}
	return true;
}


Try that.
I tried this but im not sure why its not working.


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#include <iostream>
#include <string>
#include <algorithm>
#include <ctime>
using namespace std;

void num_check(double num);

int main() {

	double pretty_category,so_category,ugly_category;
	cout << "How many flowers are in the Pretty Category?" << endl;
	num_check(pretty_category);
	cout << "How many flowers are in the So-So Category?" << endl;
	cin >> so_category;
	cout << "How many flowers are in the Ugly Category?" << endl;
	cin >> ugly_category;
	


	system("pause");
	return 0;
}  



void num_check(double num) {
	
	cin >> num;

	while (num < 0) {
		cout << "Error try again" << endl;
		cin >> num;
	}
	return ;
}
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