Using a for loop?

Question

If I were to place a for loop into another for loop like

for(....)
{
etc...
for(....)
{
etc....
}
}
which loop would be triggered first? would it be the outer most loop then trigger each inner loop once, or will it do the outer most loop first then cycle through each loop nested inside and then finish off the outer loop?

Forgive me if that sounded a bit confusing wasn't sure how else to explain it.

Answer 1

the outer loop will be the first one to trigger then the inner loop. until the inner loop is not done it will continue until its done then back to the outer loop then continue to process.

Answer 2

I give you an example, may be helpful to understand. Let us say outer loop is to write its execution turn like 1, 2, 3, ... and to execute inner loop. Outer loop executes 5 times. And the inner loop is to write a, b, c, ... up to h. The result will be some thing like this:
1
a b c d e f g h
2
a b c d e f g h
3
a b c d e f g h
4
a b c d e f g h
5
a b c d e f g h
Probably now you will understand how they work.

Answer 3

It will execute the top of the outermost loop until it gets to the innermost for loop, then it will push the stack (locally declared variables and other state information), and execute the innermost for loop until the condition for the inner loop ends. Then it will return to the previous stack state and continue executing the outer loop, which will trigger the inner loop again, causing it to execute, and so on.

Answer 4

If i remember from my visual basic class correctly, the outter one would be triggered first. The outter one is only triggered once then the outter loop is triggered until it meets its constraints (ie x=4) then the outter loop is tested once more then the next loop is again goes through until its done then back to the outter loop. The whole process is done whenever the outter loop meets its constraints.

Answer 5

here's an example..


for ($i=0;$i<=10;$i++) { // loop 1
// this loop executes any instructions, including loop 2

for ($x=0;$x<=10;$x++) { // loop 2
// this loops executes any instructions, including loop 3

for ($y=0;$y<=10$y++) { // loop 3
// this loop executes any instructions until $y == 10/
// when 4y == 10, it drops back to loop 2, and this gets executed again
// when $x == 10, loop 1 executes again, causing loop 2 to execute, and then loop 3. this continues until $i == 10

}
}
}

here, i even setup a visual..
http://evildomain.org/loops.php

Answer 6

the loops finish from inside to out.

Answer 7

outer loop