C Exercises: Display the pattern in which the first and a last number of each row will be 1

C For Loop: Exercise-36 with Solution

Write a C program to display a such a pattern for n rows using a number that starts with 1 and each row will have a 1 as the first and last number.
The pattern is as follows:

   1
  121
 12321

Visual Presentation:

Sample Solution:

C Code:

#include <stdio.h> // Include the standard input/output header file.

int main()
{
   int i, j, n; // Declare variables for loop counters and the number of rows.

   printf("Input number of rows : "); // Prompt the user to input the number of rows.
   scanf("%d", &n); // Read the input from the user.

   for(i = 0; i <= n; i++) // Loop to generate each row of the pattern.
   {
     /* Print blank spaces */
     for(j = 1; j <= n - i; j++) // Loop to print spaces before the numbers.
       printf(" ");

     /* Display numbers in ascending order up to the middle */
     for(j = 1; j <= i; j++) // Loop to print numbers in ascending order.
       printf("%d", j);

     /* Display numbers in reverse order after the middle */
     for(j = i - 1; j >= 1; j--) // Loop to print numbers in descending order.
       printf("%d", j);

     printf("\n"); // Move to the next line after printing a row.
   }
    return 0;  // Indicate that the program has executed successfully.
}

Sample Output:

Input number of rows : 5                                                                                      
                                                                                                              
    1                                                                                                         
   121                                                                                                        
  12321                                                                                                       
 1234321                                                                                                      
123454321

Flowchart:

C Programming Code Editor:

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