POP Lab Manual

Program 4

Write a C Program to display a Number Pattern by reading the number of rows as input. The pattern creates a symmetric pyramid where each row contains numbers from 1 to row number and then back down to 1, creating a beautiful diamond-like structure.
Pattern Structure (for n=4):

1 1 2 1 1 2 3 2 1 1 2 3 4 3 2 1

Algorithm

  1. Initialize: Start the program and declare variables n, i, j
  2. Input Rows: Read the number of rows (n) from user
  3. Outer Loop: For each row i from 1 to n
  4. Print Spaces: Print (n-i) spaces for proper alignment
  5. Ascending Numbers: Print numbers from 1 to i with spaces
  6. Descending Numbers: Print numbers from (i-1) down to 1 with spaces
  7. New Line: Move to next line after completing each row
  8. Terminate: Stop the program after all rows are printed

Flowchart

START
→
Input n
→
i = 1 to n
→
Print Spaces
→
Print 1 to i
→
Print i-1 to 1
→
New Line
→
STOP

Code 

#include <stdio.h>


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

    printf("Enter number of rows: ");
    scanf("%d", &n);

    for (i = 1; i <= n; i++) {
        // Print spaces
        for (j = 1; j <= n - i; j++) {
            printf("  ");
        }

        // Print increasing numbers
        for (j = 1; j <= i; j++) {
            printf("%d ", j);
        }

        // Print decreasing numbers
        for (j = i - 1; j >= 1; j--) {
            printf("%d ", j);
        }

        printf("\n");
    }

    return 0;
}

Sample Output 


// Example 1 - For n = 4
Enter number of rows: 4
      1 
    1 2 1 
  1 2 3 2 1 
1 2 3 4 3 2 1 

// Example 2 - For n = 5
Enter number of rows: 5
        1 
      1 2 1 
    1 2 3 2 1 
  1 2 3 4 3 2 1 
1 2 3 4 5 4 3 2 1 

// Example 3 - For n = 6
Enter number of rows: 6
          1 
        1 2 1 
      1 2 3 2 1 
    1 2 3 4 3 2 1 
  1 2 3 4 5 4 3 2 1 
1 2 3 4 5 6 5 4 3 2 1 

// Example 4 - For n = 3
Enter number of rows: 3
    1 
  1 2 1 
1 2 3 2 1
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