C Program to Display a Diamond Pattern Using Asterisks

C Program Pattern 

C Program to Display a Diamond Pattern Using Asterisks 
Example:

#include <stdio.h>

int main()

{

  int n,a, k;

  printf("Enter number of rows\n");

  scanf("%d", &n);

  for (k = 1; k <= n; k++)

  {

    for (a = 1; a <= n-k; a++)

      printf(" ");

    for (a = 1; a <= 2*k-1; a++)

      printf("*");

    printf("\n");

  }

  for (k = 1; k <= n - 1; k++)

  {

    for (a = 1; a <= k; a++)

      printf(" ");

    for (a = 1 ; a <= 2*(n-k)-1; a++)

      printf("*");

    printf("\n");

  }

  return 0;

}

C Program to Display a Diamond Pattern Using Asterisks
Explain Program

Step :1

#include <stdio.h>

 input-output use printf() & scanf() function.

Step :2

int main()

The entry point of the C program. All execution .

Step :3

int n, a, k;

Three integer variables are declared:

 n: Number of rows for the top half of the diamond.

 k: Loop counter for rows.

 a: Loop counter for columns 

Step :4

printf("Enter number of rows\n");

scanf("%d", &n);

user to enter an integer (n).

 numbers determines the height of the top half  diamond.

Step :5

for (k = 1; k <= n; k++)

{

  for (a = 1; a <= n-k; a++)

    printf(" "); 

  for (a = 1; a <= 2*k-1; a++)

    printf("*"); 

  printf("\n");

}

This loop print the upper half of the diamond

 Outer loop (k = 1 to n)

Each iteration of k represents one row.

  First inner loop (a = 1 to n - k):Prints leading spaces to center-align the stars.

 Example: If k = 1, it prints n - 1 spaces.

 Spaces decrease as you move down (k increases).

 Second inner loop (a = 1 to 2*k - 1):

Prints the stars on each line.

 Stars increase by 2 in each row: 1, 3, 5, 7, ... 

Step :6

printf("\n");

After each row

Step :7

for (k = 1; k <= n - 1; k++)

{

  for (a = 1; a <= k; a++)

    printf(" ");

   for (a = 1 ; a <= 2*(n-k)-1; a++)

    printf("*");

   printf("\n");

}

Outer loops

   (k = 1 to n - 1)

 1 to n - 1 to the middles row  already printed to the top part.

 First inner loop (a = 1 to k):

Prints leading spaces, which increase with each row.

 Second inner loop (a = 1 to 2*(n-k) - 1):

Prints the stars.

 Number of stars decreases by 2 in each row: 2*(n-k)-1 

C Program to Display a Diamond Pattern Using Asterisks
Output:

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