Question

How to print a given matrix in spiral form with C

Answer 1

#include <stdio.h>

#define COLS 4
#define ROWS 4

void PrintMatrixInSpiralForm(int matrix[][COLS]) {
    int top = 0, bottom = COLS - 1;
    int left = 0, right = ROWS - 1;

    while (1) {
        if (left > right) {
            break;
        }

        // top row
        for (int i = left; i <= right; i++) {
            printf("%d ", matrix[top][i]);
        }
        printf("\n");
        top++; // next row

        if (top > bottom) {
            break;
        }

        // right column
        for (int i = top; i <= bottom; i++) {
            printf("%d ", matrix[i][right]);
        }
        printf("\n");
        right--; // previous column

        if (left > right) {
            break;
        }

        // bottom row
        for (int i = right; i >= left; i--) {
            printf("%d ", matrix[bottom][i]);
        }
        printf("\n");
        bottom--; // previous row

        if (top > bottom) {
            break;
        }

        // left column
        for (int i = bottom; i >= top; i--) {
            printf("%d ", matrix[i][left]);
        }
        printf("\n");
        left++; // next column
    }
}

int main()
{
    int matrix[ROWS][COLS] = { { 1,   2,  3,  4 },
                               { 5,   6,  7,  8 },
                               { 9,  10, 11, 12 },
                               { 13, 14, 15, 16 } };

    PrintMatrixInSpiralForm(matrix);
}




/*
run:

1 2 3 4
8 12 16
15 14 13
9 5
6 7
11
10

*/

 

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