C Program to Print Number Pattern

The idea of pattern based programs is to understand the concept of nesting of for loops and how and where to place the alphabets / numbers / stars to make the desired pattern.
Write a program to print the pattern of numbers in the following manner using for loop 

    1
   232
  34543
 4567654
567898765

In almost all types of pattern programs, two things that you must take care: 

1. No. of lines
2. If the pattern is increasing or decreasing per line?

Implementation

C

// C program to illustrate the above
// given pattern of numbers.
#include <stdio.h>

int main()
{
    int n = 5, i, j, num = 1, gap;

    gap = n - 1;

    for (j = 1; j <= n; j++) {
        num = j;

        for (i = 1; i <= gap; i++)
            printf(" ");

        gap--;

        for (i = 1; i <= j; i++) {
            printf("%d", num);
            num++;
        }
        num--;
        num--;
        for (i = 1; i < j; i++) {
            printf("%d", num);
            num--;
        }
          printf("\n");
    }

    return 0;
}

Output

    1
   232
  34543
 4567654
567898765

Time Complexity: O(n²), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.

Program for Pyramid Pattern