Unit 1, Diamond

#include <stdio.h>

int main(void) {
    int height;

    printf("Please enter the height of the first half of the diamond:\n");
    scanf("%d", &height);

    if (height < 1) {
    printf("Invalid user input. Minimum size of the diamond is one.\n");
    return 0;
    }

    for (int y = 0; y <= height * 2; y++) {
        for (int x = 0; x <= height * 2; x++) {
        if (x + y == height || x - y == height ||
            y - x == height || x + y == 3 * height)
            printf("*");
        else
        printf(" ");
    }
    printf("\n");
    }
}