C++ misunderstandings.

Question

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

using namespace std;

int main() {
const short minValue = 1;
const short maxValue = 6;
srand(time(0));
short first = (rand() % (maxValue - minValue + 1)) + 1;
short second = (rand() % (maxValue - minValue + 1)) + 1;
cout << first<<", " << second;
return 0;
}

What is the use of these two "+1" in the code below?
"(rand() % (maxValue - minValue + 1)) + 1"

Answer 1

Eriito rand()%N returns random number between 0 to N-1 .
rand()%6 means 0 to 5. So that "+1" to include upper limit(6).

Second "+1" was mistake change it to "+minValue" then only you can get random number between min and Max value.

For example assume min=2 max=6
rand()%(maxValue - minValue +1))+minValue

rand()%(6-2+1)+2
rand()%(4)+2
It generates random 'between 0 to 4', then add minValue to increase 0 to the minimum value.

If rand() was 1, 1+2=3 so the output between minValue and maxValue