Example: Transpose Static Matrix using Pointers in C

// Transpose Static Matrix using Pointers
#include <stdio.h>

// Function to print a matrix
void printMatrix(int *matrix, int rows, int cols) {
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            printf("%d\t", *(matrix + i * cols + j));
        }
        printf("\n");
    }
}

// Function to transpose a matrix using pointers
void transposeMatrix(int *original, int *transposed, int rows, int cols) {
    // Iterate through the original matrix
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            // original[i][j] becomes transposed[j][i]
            // Access original[i][j] as *(original + i * cols + j)
            // Store it in transposed[j][i] as *(transposed + j * rows + i)
            *(transposed + j * rows + i) = *(original + i * cols + j);
        }
    }
}

int main() {
    // Step 1: Define original matrix dimensions
    int rows = 3;
    int cols = 2;

    // Step 2: Declare static original matrix and its transpose
    int originalMatrix[3][2] = {
        {1, 2},
        {3, 4},
        {5, 6}
    };
    int transposedMatrix[2][3]; // Transposed matrix will have cols x rows dimensions

    printf("Original Matrix (%dx%d):\n", rows, cols);
    // Pass originalMatrix as (int*) to print function
    printMatrix((int*)originalMatrix, rows, cols);

    // Step 3: Transpose the matrix using the function
    // Pass originalMatrix and transposedMatrix as (int*)
    transposeMatrix((int*)originalMatrix, (int*)transposedMatrix, rows, cols);

    printf("\nTransposed Matrix (%dx%d):\n", cols, rows);
    // Pass transposedMatrix as (int*) to print function (note new rows/cols for printing)
    printMatrix((int*)transposedMatrix, cols, rows);

    return 0;
}