Cannot understand for loop with two variables [duplicate]

Question

When I use two variables in a for loop with different conditions two conditions like I have used below i<3,j<2 the for loop is always executing till the second condition fails.

#include<iostream>
#include<conio.h>
using namespace std ;
int main()
{
int i,j ;
for(i=0,j=0;i<3,j<2;i++,j++)
{
    cout<<"hello" ;
}
getch() ;
return 0 ;
} 

In that code, hello is printed 2 times. Why?

If I use i<3,j<10, "Hello" is printed 10 times. I can't understand why the first condition is being neglected. Is it compiler dependent or something else?

Every thing works normal if I replace with conditions like || (OR) or &&(AND).An other thing is that I cannot initialize i and j in the for loop itself, it is showing me an error, but works fine when I declare variables in C style or one variable outside the for loop, why is it so?

Compiler I have used is Orwell Dev C++.
Thanks in advance.

Answer 1

for(i=0,j=0;i<3,j<2;i++,j++)

is equivalent to

for(i=0,j=0;j<2;i++,j++)

The comma expression takes on the value of the last expression.

Whichever condition is first, will be disregarded, and the second one will be used only.