C program to interchange diagonals of a matrix

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C program to interchange diagonals of a matrix

Write a C program to read elements in a matrix and interchange elements of primary(major) diagonal with secondary(minor) diagonal. C program for interchanging diagonals of a matrix. Logic to interchange diagonals of a matrix in C programming.

Required knowledge

Basic C programming, C for loop, ArrayS

Program to interchange diagonal elements of a matrix

 
/**
 * C program to interchange diagonals of a matrix
 */
 
#include <stdio.h>
#define MAX_ROWS 3
#define MAX_COLS 3

int main()
{
    int A[MAX_ROWS][MAX_COLS];
    int row, col, size, temp;
 
    /* Input elements in matrix from user */
    printf("Enter elements in matrix of size %dx%d: \n", MAX_ROWS, MAX_COLS);
    for(row=0; row<MAX_ROWS; row++)
    {
        for(col=0; col<MAX_COLS; col++)
        {
            scanf("%d", &A[row][col]);
        }
    }

    size = (MAX_ROWS < MAX_COLS) ? MAX_ROWS : MAX_COLS;
 
    /*
     * Interchange diagonal of the matrix
     */
    for(row=0; row<size; row++)
    {
        col = row;
 
        temp = A[row][col];
        A[row][col] = A[row][(size-col) - 1];
        A[row][(size-col) - 1] = temp;
    }
 
    /*
     * Print the interchanged diagonals matrix
     */
    printf("\nMatrix after diagonals interchanged: \n");
    for(row=0; row<MAX_ROWS; row++)
    {
        for(col=0; col<MAX_COLS; col++)
        {
            printf("%d ", A[row][col]);
        }
 
        printf("\n");
    }
 
    return 0;
}

Output:

Enter elements in matrix of size 3x3:

10 20 30
40 50 60
70 80 90

Matrix after diagonals interchanged:

30 20 10
40 50 60
90 80 70

Process returned 0 (0x0) execution time : 16.921 s

Program to interchange diagonal elements of a matrix

/**
 * C program to interchange diagonals of a matrix
 */

#include <stdio.h>

int main()
{
    int A[10][10];
    int row, col, size, temp,m,n;
    printf("Enter no rows:");
    scanf("%d",&m);
    printf("Enter no of columns:");
    scanf("%d",&n);

    /* Input elements in matrix from user */
    printf("Enter elements in matrix of size %dx%d: \n", m, n);
    for(row=0; row<m; row++)
    {
        for(col=0; col<n; col++)
        {
            scanf("%d", &A[row][col]);
        }
    }

    size = (m < n) ? m : n;

    /*
     * Interchange diagonal of the matrix
     */
    for(row=0; row<size; row++)
    {
        col = row;

        temp = A[row][col];
        A[row][col] = A[row][(size-col) - 1];
        A[row][(size-col) - 1] = temp;
    }

    /*
     * Print the interchanged diagonals matrix
     */
    printf("\nMatrix after diagonals interchanged: \n");
    for(row=0; row<m; row++)
    {
        for(col=0; col<n; col++)
        {
            printf("%d ", A[row][col]);
        }

        printf("\n");
    }

    return 0;
}

Output:

Enter no rows:3
Enter no of columns:3
Enter elements in matrix of size 3x3:

10 11 12
13 14 15
16 17 18

Matrix after diagonals interchanged:

12 11 10
13 14 15
18 17 16

Process returned 0 (0x0) execution time : 32.359 s

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