Question

How to declare and initialize a three-dimensional (3D) array in C

Answer 1

#include <stdio.h>

int main() {
    // 2 layers, 3 rows, 4 columns
    int arr[2][3][4] = {
        {
            {1, 2, 3, 4},
            {5, 6, 7, 8},
            {9, 10, 11, 12}
        },
        {
            {13, 14, 15, 16},
            {17, 18, 19, 20},
            {21, 22, 23, 24}
        }
    };

    // Print the array
    for (int i = 0; i < 2; i++) {
        printf("Layer %d:\n", i);
        for (int j = 0; j < 3; j++) {
            for (int k = 0; k < 4; k++) {
                printf("%3d ", arr[i][j][k]);
            }
            printf("\n");
        }
        printf("\n");
    }

    return 0;
}




/*
run:

Layer 0:
  1   2   3   4 
  5   6   7   8 
  9  10  11  12 

Layer 1:
 13  14  15  16 
 17  18  19  20 
 21  22  23  24 

*/

 

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