Print Hollow Star Pyramid in Diamond Shape

1#include <stdio.h>
2
3int main() {
4    int rows;
5    
6    printf("Enter number of rows: ");
7    scanf("%d", &rows);
8    
9    printf("\n");
10    
11    // Upper half
12    for (int i = 1; i <= rows; i++) {
13        // Leading spaces
14        for (int j = 1; j <= rows - i; j++) {
15            printf(" ");
16        }
17        
18        // Stars and hollow
19        for (int j = 1; j <= 2 * i - 1; j++) {
20            if (j == 1 || j == 2 * i - 1) {
21                printf("*");
22            } else {
23                printf(" ");
24            }
25        }
26        printf("\n");
27    }
28    
29    // Lower half
30    for (int i = rows - 1; i >= 1; i--) {
31        // Leading spaces
32        for (int j = 1; j <= rows - i; j++) {
33            printf(" ");
34        }
35        
36        // Stars and hollow
37        for (int j = 1; j <= 2 * i - 1; j++) {
38            if (j == 1 || j == 2 * i - 1) {
39                printf("*");
40            } else {
41                printf(" ");
42            }
43        }
44        printf("\n");
45    }
46    
47    return 0;
48}