C program to print hollow diamond star pattern

  • Write a program in C to print hollow diamond star pattern using for loops.
  • How to print an empty diamond shape star pattern in C.
Hollow Diamond star pattern program's output should be:
     *
    * *
   *   *
  *     *
 *       *
*         *
 *       *
  *     *
   *   *
    * *
     *

Required Knowledge

Algorithm to print hollow diamond star pattern using for loop
This program is similar to diamond star pattern. The only difference is, here we will only print first and last star character of any row and we will replace all internal star characters by space character.

C program to print hollow or empty diamond star pattern

#include<stdio.h>

int main() {
    int i, space, rows=7, star=0;
    
    /* Printing upper triangle */
    for(i = 1; i <= rows; i++) {
        /* Printing spaces */
        for(space = 1; space <= rows-i; space++) {
           printf(" ");
        }
        /* Printing stars */
        while(star != (2*i - 1)) {
         if(star == 0 or star==2*i-2)
                printf("*");
            else 
                printf(" ");
            star++;
        }
        star=0;
        /* move to next row */
        printf("\n");
    }
    rows--;
    /* Printing lower triangle */
    for(i = rows;i >= 1; i--) {
        /* Printing spaces */
        for(space = 0; space <= rows-i; space++) {
           printf(" ");
        }
        /* Printing stars */
        star = 0;
        while(star != (2*i - 1)) {
         if(star == 0 or star==2*i-2)
                printf("*");
            else 
                printf(" ");
            star++;
        }
        printf("\n");
    }

    return 0;
}
Output
     *
    * *
   *   *
  *     *
 *       *
*         *
 *       *
  *     *
   *   *
    * *
     *

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