How to mirror a matrix across the main diagonal in C

1 Answer

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#include <stdio.h>

#define SIZE 3

void printMatrix(int matrix[SIZE][SIZE]) {
    for (int i = 0; i < SIZE; i++) {
        for (int j = 0; j < SIZE; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }
}

// Function to mirror the matrix across the main diagonal
void mirrorMatrix(int matrix[SIZE][SIZE]) {
    for (int i = 0; i < SIZE; i++) {
        for (int j = i + 1; j < SIZE; j++) {
            // Swap elements across the diagonal
            int temp = matrix[i][j];
            matrix[i][j] = matrix[j][i];
            matrix[j][i] = temp;
        }
    }
}

int main() {
    int matrix[SIZE][SIZE] = {
        {1, 2, 3},
        {4, 5, 6},
        {7, 8, 9}
    };

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

    mirrorMatrix(matrix);

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

    return 0;
}



/*
run:

Original Matrix:
1 2 3 
4 5 6 
7 8 9 
Mirrored Matrix:
1 4 7 
2 5 8 
3 6 9 

*/

 



answered Aug 27, 2025 by avibootz

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