Hollow Diamond Dry Run in C

Hollow Diamond is an interactive C dry run visualizer from the Patterns programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Hollow Diamond Program Code

#include <stdio.h>
int main() {
    int n = 4, i, j, k;
    // Top
    for(i = 1; i <= n; i++) {
        for(j = 1; j <= n - i; j++) printf(" ");
        for(k = 1; k <= 2 * i - 1; k++) {
            if(k == 1 || k == 2 * i - 1) printf("*");
            else printf(" ");
        }
        printf("\n");
    }
    // Bottom
    for(i = n - 1; i >= 1; i--) {
        for(j = 1; j <= n - i; j++) printf(" ");
        for(k = 1; k <= 2 * i - 1; k++) {
            if(k == 1 || k == 2 * i - 1) printf("*");
            else printf(" ");
        }
        printf("\n");
    }
    return 0;
}

View the complete Patterns programs page.