Write a C program to print hollow sandglass star pattern using for loop.
#include <stdio.h> int main() { int rows, i, j, k; printf("Enter Hollow Sandglass Star Pattern Rows = "); scanf("%d", &rows); printf("Printing Hollow Sandglass Star Pattern\n"); for (i = 1; i <= rows; i++) { for (j = 1; j < i; j++) { printf(" "); } for (k = i; k <= rows; k++) { if (i == 1 || k == i || k == rows) { printf("* "); } else { printf(" "); } } printf("\n"); } for (i = rows - 1; i >= 1; i--) { for (j = 1; j < i; j++) { printf(" "); } for (k = i; k <= rows; k++) { if (i == 1 || k == i || k == rows) { printf("* "); } else { printf(" "); } } printf("\n"); } }

This C example uses the while loop to print the hollow sandglass star pattern.
#include <stdio.h> int main() { int rows, i, j, k; printf("Enter Hollow Sandglass Star Pattern Rows = "); scanf("%d", &rows); printf("Printing Hollow Sandglass Star Pattern\n"); i = 1; while (i <= rows) { j = 1; while (j < i) { printf(" "); j++; } k = i; while (k <= rows) { if (i == 1 || k == i || k == rows) { printf("* "); } else { printf(" "); } k++; } printf("\n"); i++; } i = rows - 1; while (i >= 1) { j = 1; while (j < i) { printf(" "); j++; } k = i; while (k <= rows) { if (i == 1 || k == i || k == rows) { printf("* "); } else { printf(" "); } k++; } printf("\n"); i--; } }
Enter Hollow Sandglass Star Pattern Rows = 11
Printing Hollow Sandglass Star Pattern
* * * * * * * * * * *
* *
* *
* *
* *
* *
* *
* *
* *
* *
*
* *
* *
* *
* *
* *
* *
* *
* *
* *
* * * * * * * * * * *
This C program displays the hollow sandglass pattern of stars using a do while loop.
#include <stdio.h> int main() { int rows, i, j, k; printf("Enter Hollow Sandglass Star Pattern Rows = "); scanf("%d", &rows); printf("Printing Hollow Sandglass Star Pattern\n"); i = 1; do { j = 1; do { printf(" "); } while (j++ <= i); k = i; do { if (i == 1 || k == i || k == rows) { printf("* "); } else { printf(" "); } } while (++k <= rows); printf("\n"); } while (++i <= rows); i = rows - 1; do { j = 1; do { printf(" "); } while (j++ <= i); k = i; do { if (i == 1 || k == i || k == rows) { printf("* "); } else { printf(" "); } } while (++k <= rows); printf("\n"); } while (--i >= 1); }
Enter Hollow Sandglass Star Pattern Rows = 14
Printing Hollow Sandglass Star Pattern
* * * * * * * * * * * * * *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
*
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* * * * * * * * * * * * * *
This C example code allows the user to enter the character and prints the hollow sandglass pattern of a given character.
#include <stdio.h> void HollowSandglassPattern(int rows, char ch); int main() { int rows; char ch; printf("Enter Character for Hollow Sandglass Pattern = "); scanf("%c", &ch); printf("Enter Hollow Sandglass Star Pattern Rows = "); scanf("%d", &rows); printf("Printing Hollow Sandglass Star Pattern\n"); HollowSandglassPattern(rows, ch); } void HollowSandglassPattern(int rows, char ch) { int i, j, k; for (i = 1; i <= rows; i++) { for (j = 1; j < i; j++) { printf(" "); } for (k = i; k <= rows; k++) { if (i == 1 || k == i || k == rows) { printf("%c ", ch); } else { printf(" "); } } printf("\n"); } for (i = rows - 1; i >= 1; i--) { for (j = 1; j < i; j++) { printf(" "); } for (k = i; k <= rows; k++) { if (i == 1 || k == i || k == rows) { printf("%c ", ch); } else { printf(" "); } } printf("\n"); } }
Enter Character for Hollow Sandglass Pattern = $
Enter Hollow Sandglass Star Pattern Rows = 16
Printing Hollow Sandglass Star Pattern
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $