Example: Interchange Two Columns in a Matrix in C

// Interchange Two Columns in a Matrix
#include <stdio.h>

#define ROWS 3
#define COLS 3

// Function to print the matrix
void printMatrix(int matrix[ROWS][COLS]) {
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }
}

int main() {
    // Step 1: Initialize the matrix
    int matrix[ROWS][COLS] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

    int col1, col2; // Columns to interchange
    int temp;       // Temporary variable for swapping

    printf("Original Matrix:\n");
    printMatrix(matrix);

    // Step 2: Get user input for columns to swap
    printf("Enter the first column to interchange (0 to %d): ", COLS - 1);
    scanf("%d", &col1);
    printf("Enter the second column to interchange (0 to %d): ", COLS - 1);
    scanf("%d", &col2);

    // Validate input columns
    if (col1 < 0 || col1 >= COLS || col2 < 0 || col2 >= COLS) {
        printf("Invalid column numbers. Please enter values between 0 and %d.\n", COLS - 1);
        return 1;
    }

    // Step 3: Interchange the elements of the specified columns
    for (int i = 0; i < ROWS; i++) {
        temp = matrix[i][col1];
        matrix[i][col1] = matrix[i][col2];
        matrix[i][col2] = temp;
    }

    printf("\nMatrix after interchanging Column %d and Column %d:\n", col1, col2);
    printMatrix(matrix);

    return 0;
}