Program to print the given number pattern 
55555
4444
333
22
1

C Programming Language / Loop control in C Language

26620

Program:

/**
 * C program to print number pattern
 * www.atnyla.com
 */

#include <stdio.h>

int main()
{
    int i, j, N;

    printf("Enter N: ");
    scanf("%d", &N);

    for(i=N; i>=1; i--)
    {
        for(j=1; j<=i; j++)
        {
            printf("%d", i);
        }

        printf("\n");
    }

    return 0;

}

Output:

Enter N: 5
55555
4444
333
22
1

Explanation:

Required knowledge

Basic C programming, Loop

Logic to print the given number pattern 1

Before we discuss about logic of printing these patterns. I would recommend you to check out some similar number patterns. As both of the patterns mentioned in this program are just vertically flipped image of

1
22
333
4444
55555

Now, moving on to the logic of first pattern that we need to print. Have a careful eye on to the below pattern

55555
4444
333
22
1

Logic to print the above pattern:

  1. To iterate through rows, initialize an outer loop from N to 1 (where N is the total number of rows). Note that I have initialized the loop from N to 1 not from 1 to N as the pattern is in descending order hence it will help in the inner loop. As both 1 to N or N to 1 will iterate N times.
  2. To print numbers, initialize an inner loop from 1 to current_row_number (note that the current row number will be like n.., 4, 3...1 in decreasing order). Inside this loop print the value of current_row_number.

And you are done, lets implement this now.

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