The Hollow Diamond Pattern is a variation of the diamond pattern where only the edges of the diamond are filled with characters and the inside remains empty. This creates a hollow effect in the shape of a diamond. In this article, we will learn how to print the Hollow Diamond Pattern using C program.
#include <stdio.h>
int main() {
int n = 5;
// First outer loop to iterator through each row
for (int i = 0; i < 2 * n - 1; i++) {
// Assigning values to the comparator according to
// the row number
int comp;
if (i < n) comp = 2 * (n - i) - 1;
else comp = 2 * (i - n + 1) + 1;
// First inner loop to print leading whitespaces
for (int j = 0; j < comp; j++)
printf(" ");
// Second inner loop to print star * and inner
// whitespaces
for (int k = 0; k < 2 * n - comp; k++) {
if (k == 0 || k == 2 * n - comp - 1)
printf("* ");
else
printf(" ");
}
printf("\n");
}
return 0;
}
#include <stdio.h>
int main() {
int n = 5;
// First outer loop to iterator through each row
for (int i = 0; i < 2 * n - 1; i++) {
// Assigning values to the comparator according to
// the row number
int comp;
if (i < n) comp = 2 * (n - i) - 1;
else comp = 2 * (i - n + 1) + 1;
// First inner loop to print leading whitespaces
for (int j = 0; j < comp; j++)
printf(" ");
// Second inner loop to print star * and inner
// whitespaces
for (int k = 0; k < 2 * n - comp; k++) {
if (k == 0 || k == 2 * n - comp - 1)
printf("%d ", k + 1);
else
printf(" ");
}
printf("\n");
}
return 0;
}
#include <stdio.h>
int main() {
int n = 5;
// First outer loop to iterator through each row
for (int i = 0; i < 2 * n - 1; i++) {
// Assigning values to the comparator according to
// the row number
int comp;
if (i < n) comp = 2 * (n - i) - 1;
else comp = 2 * (i - n + 1) + 1;
// First inner loop to print leading whitespaces
for (int j = 0; j < comp; j++)
printf(" ");
// Second inner loop to print star * and inner
// whitespaces
for (int k = 0; k < 2 * n - comp; k++) {
if (k == 0 || k == 2 * n - comp - 1)
printf("%c ", k + 'A');
else
printf(" ");
}
printf("\n");
}
return 0;
}
Output
* | 1 | A
* * | 1 3 | A C
* * | 1 5 | A E
* * | 1 7 | A G
* * | 1 9 | A I
* * | 1 7 | A G
* * | 1 5 | A E
* * | 1 3 | A C
* | 1 | A
Explanation:
- Outer loop iterates through each row from 0 to 2 * n - 2 (as total 2 * n - 1 rows).
- comp determines the number of leading spaces based on the current row number.
- For the first half (i < n): comp = 2 * (n - i) - 1.
- For the second half (i >= n): comp = 2 * (i - n + 1) + 1.
- First inner loop prints leading white spaces in each row.
- Second inner loop iterates through the columns in the row to print the diamond's outline.
- For the first (k == 0) or last star position in the row (k == 2 * n - comp - 1), it prints *.
- For positions in between, it prints spaces (" "), leaving the diamond hollow.
- After completing a row, printf("\n") moves to the next line.
The above explanation is for * pattern only. You can use any character to place of star *.