How do you put the results of a loop into an array?

[vichu99]

How do you put the results of a loop into an array? For example a for-loop. I came up with this but theres an error:

#include <iostream>
#include <cmath>
using namespace std;



int main(){
int i;
int a[]={i};
for(i=1; i<10; i++){
int a[]={i};}
cout <<a[i];
int b;
cin >> b;
}

[vlad from moscow]

const int N = 10;
int a[N];

for ( int i = 0; i < N; i++ ) a[i] = i;

Or

const int N = 10;
int a[N];

std::iota( a, a + N, 0 );

[vichu99]

Thanks is there a way to do it if the value N is unknown?

[vlad from moscow]

You can either dynamically allocate an array when its size will be known or use std::vector.