simplest coding "for" using i

Could anyone help me with the simplest way of coding a triangle..
starting with a 1, and a 123 underneath that and a 12345 underneath that and 1234567 "" "" and then ending with 123456789 underneath that..

Do you want a triangle like:

Code:

---

1
123
12345
1234567
123456789

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or

Code:

---

    1
  123
  12345
 1234567
123456789

---

For the first one try this:

Code:

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main()
{
int i,c;

for(i=1;i<=9;i+=2)
  {
  for(c=1;c<=i;c++)
      {     
      printf("%d",c);
      }
    printf("\n");
    }

}

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