I would like to edit numbers in p2 according to the code in for cycle.
But If I try to write out actual number in p2, I don´t see anything in output.
What could I change to see it?

#include <iostream>

using namespace std;

int main()
{
        
    int p1[10]={-5,-8,0,5,0,-8,-11,-2,1,-7};
    int p2[10]={0,0,0,0,0,0,0,0,0,0};
    
    for(int i; i >0; i++){
        p2[i] = p2[i] - p1[i];
        cout << p2[i];
    }
    
}

>Solution :

As pointed out by Ilya, you need to change the condition in the for loop. Right now, at the beginning of the for loop, i = 0, so the for loop never starts. Change it to the following:

#include <iostream>

using namespace std;

int main()
{
        
    int p1[10]={-5,-8,0,5,0,-8,-11,-2,1,-7};
    int p2[10]={0,0,0,0,0,0,0,0,0,0};
    
    for(int i = 0; i < 10; i++){
        p2[i] = p2[i] - p1[i];
        cout << p2[i];
    }
    
}