Could anyone tell me for the code below, what is the role of each i and j ??

Question

#include <iostream>
using namespace std;

int main(){
int i,j;
for(int i=1;i<=20;i++){
for(int j=1;j<=i;j++){
cout<<j;
}
cout<<"\n";
return 0;
}

Answer 1

@RiGeL your for loop on "i" is missing its closing curly bracket, just notify you.

Answer 2

i and J here are Iterators, they are here to make a loop. they are assigned a value, then you specify the expression that they have to fallow and typically you increment or decrement then in every loop step

Answer 3

@paul thank you alot

Answer 4

@Ipang thank you

Answer 5

The inner loop will print all the values of j each time the outer loop runs, from 1 to the current value of i.
So for i=4, it will print 1,1,2,1,2,3,1,2,3,4.