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

Pictorial Presentation:

Sample Solution:

C Code:

#include <stdio.h>

void main()
{
   int i,j,n;
   printf("Input number of rows : ");
   scanf("%d",&n);
   for(i=0;i<=n;i++)
   {
     /* print blank spaces */
     for(j=1;j<=n-i;j++)
	printf(" ");
     /* Display number in ascending order upto middle*/
     for(j=1;j<=i;j++)
       printf("%d",j);
 
     /* Display  number in reverse order after middle */
       for(j=i-1;j>=1;j--)
	  printf("%d",j);
 
     printf("\n");
   }
}

Sample Output:

Input number of rows : 5                                                                                      
                                                                                                              
    1                                                                                                         
   121                                                                                                        
  12321                                                                                                       
 1234321                                                                                                      
123454321

Flowchart:

C Programming Code Editor:

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