Is their any difference in iterating a for loop from top to bottom and bottom to top in time? if so what is the reason?

Question

The main Difference.

Answer 1

I mean that if you want to print "1" 100 times using a for loop by iterating from 1 to 100 and 100 to 1, Will there be any difference in time taken for Execution.?

Answer 2

Likely not. It's the same thing backwards.

However, using ++i instead of i++ can make a difference in execution time (We're talking nanoseconds).

for(int i = 0; i < 100; ++i){}

i++ must first keep track of the variable:
int temp = i;
Do the operation.
i = blah;
Then increment it.
i = i + 1;

Meanwhile ++i just increments.
i = i + 1.

So, you can generally expect ++i to be a faster operation.

Answer 3

Uh.. top to bottom and bottom to top can mean many things.