Thread: Trying to make a triangle

the output should be:

Code:

Size: 4  Seed: 1
1  2  4  7
   3  5  8
      6  9
         0

Updated code:

Code:

main()
{
        size = 6;
        seed = 3;

        for(row = 0; row < size; row++)
        {
        cnum = seed;

                for(col = 0; col < size; col++)
                {
                        if(col == row)
                        {
                                printf("%i ", cnum + row);
                        }
                        else if(col > row)
                        {
                                if((cnum = cnum + col) <= 9)
                                {
                                        printf("%i ", cnum);
                                }
                                else
                                {
                                        cnum = cnum - 10;
                                        printf("%i ", cnum);
                                }
                        }
                        else
                        {
                                printf("  ");
                        }
                }
        printf("\n");
        }
}

What do you mean by "Trying to make a triangle"?

Greets,
Philip

Code:

1  2  4  7
   3  5  8
      6  9
         0

I think with your settings (seed=1, size=4), the output should end in a line that contains a 1 instead of a 0...

Hint 0: no Parkside Triangle can contain zeros.

I can get the first row, but after that it all goes to hell.

Well, can you spot any obvious difference between the first row and all the other rows by looking at the output of your program?

Hint 1:
Try to get the correct numbers first, then use indenting to make it look as specified (I didn't test it, but this should solve your problem)

Hint 2:
In every row, the first number only depends on the seed, not on the size


Apart from that, it is desirable to explicitly state that seed, size, row, col, cnum and main() are of type int (or function returning int respectively).

Greets,
Philip

EDIT: you can compute the value of any of these numbers in constant time by using only seed, row and col. It's probably not the goal of your exercise to find this expression, but once you have it, the rest is easy. If you can't find it immediately, stick to your current approach.

Okay, I've got the 1st numbers in each row correct, but I can't figure out why the other numbers are off. I'm on about hour 7 on something that shouldn't be that hard so I'll a little frustrated. Any help is appreciated, thanks.

Code:

Desired Output:
1 2 4 7
  3 5 8
    6 9
      0

Actual:
1 3 4 5
  3 6 7
    6 0
      0

Here is my code:

Code:

main()
{
        printf("Enter size and seed:  ");
        scanf("\n%i %i", &size, &seed);
        rnum = seed;

        for(row = 1; row <= size; row++)
        {
                        for(col = 1; col <= size; col++)
                        {
                                if(col == row)
                                {
                                        if(row == 1)
                                        {
                                                printf("%i ", seed);
                                        }
                                        else
                                        {
                                                rnum = y + row;
                                                if(rnum > 9)
                                                {
                                                        printf("%i ", rnum%10);
                                                }
                                                else
                                                {
                                                        printf("%i ", rnum);
                                                }
                                        }
                                y = rnum;
                                }
                                else if(col > row)
                                {
                                        cnum = rnum + col;
                                        printf("%i ", cnum%10);
                                }
                                else
                                {
                                        printf("  ");
                                }
                        }
        printf("\n");
        }
}

when seed == 1, row ==1 and col == 2 you have rnum == seed == 1

Code:

cnum = rnum + col;
printf("%i ", cnum%10);

Now tell me why do you think that 1+2 should be 2 and not 3?