C++

For an assignment I need to have a program print the inputted number, and every number before it in sequence ex:

1
12
123
1234
12345
123456

I can get it to print a list of the number but for the love of god I cant get it to print the numbers before hand.  I know theres a simple way to do it nesting a while loop in a for loop but I can't fucking figure it out.

Help for a poor retarded aspiring programmer?

I'm too lazy to read every post, but
>>1-13
YOU HELPED HIM!

I'm really getting tired of bitching about how much better /prog/ used to be, but really, every time I come on here these days there's nice little bundle of shitty threads to greet me. I can't help it; it's your problem, not mine.