a program in C that will print the following hourglass pattern

#include <stdio.h>

int main()
{
    int i, j, k;
    for (i = 1; i <= 9; i++) {
        for (j = 9 - i; j >= 1; j--) {
            printf(" ");
        }
        for (k = 1; k <= (2 * i - 1); k++) {
            printf("*");
        }
        printf("\n");
    }

    for (i = 8; i >= 1; i--) {
        for (j = 9 - i; j >= 1; j--) {
            printf(" ");
        }
        for (k = 1; k <= (2 * i - 1); k++) {
            printf("*");
        }
        printf("\n");
    }
    return 0;
}