﻿ C : Pattern with 1 as the first and last number of each row

# 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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