Print a matrix diagonally downward

Posted on Apr 26, 2020

C program to print a matrix diagonally downward.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 10

void read_matrix(int mat[MAX][MAX], int row, int col)
{
    int i, j;
    for(i=0;i<row;i++)
    {
        for(j=0;j<col;j++)
        {
            printf("Element [%d][%d]\t:",i,j);
            scanf("%d",&mat[i][j]);
        }
    }
}

void print_matrix(int mat[MAX][MAX], int row, int col)
{
    int i, j;
    for(i=0;i<row;i++)
    {
        for(j=0;j<col;j++)
        {
            printf("%d\t",mat[i][j]);
        }
        printf("\n");
    }
}

void print_diag_down(int mat[MAX][MAX], int row, int col)
{
    int i;
    int cur_row, cur_col;

    for(i=0;i<col;i++)
    {
        cur_row = 0;
        cur_col = i;
        while(cur_row < row && cur_col >=0)
        {
            printf("%d  ",mat[cur_row][cur_col]);
            cur_row++;
            cur_col--;
        }
    }

    for(i=0;i<row-1;i++)
    {
        cur_row = i+1;
        cur_col = col-1;
        while(cur_col >= 0 && cur_row < row)
        {
            printf("%d  ",mat[cur_row][cur_col]);
            cur_row++;
            cur_col--;
        }
    }

}

void main()
{
    int mat[MAX][MAX];
    int row, col;

    printf("Enter the number of rows\t:");
    scanf("%d",&row);
    printf("Enter the number of columns\t:");
    scanf("%d",&col);

    printf("Enter the elements of the matrix\n");
    read_matrix(mat, row, col);

    printf("\nMatrix entered is\n");
    print_matrix(mat, row, col);

    printf("\nMatrix in snake from last column form is \n");
    print_diag_down(mat, row, col);

    getch();
}

Output

Enter the number of rows        :3
Enter the number of columns     :6
Enter the elements of the matrix
Element [0][0]  :1
Element [0][1]  :2
Element [0][2]  :3
Element [0][3]  :4
Element [0][4]  :5
Element [0][5]  :6
Element [1][0]  :7
Element [1][1]  :8
Element [1][2]  :9
Element [1][3]  :10
Element [1][4]  :11
Element [1][5]  :12
Element [2][0]  :13
Element [2][1]  :14
Element [2][2]  :15
Element [2][3]  :16
Element [2][4]  :17
Element [2][5]  :18

Matrix entered is
1       2       3       4       5       6
7       8       9       10      11      12
13      14      15      16      17      18

Matrix in snake from last column form is
1  2  7  3  8  13  4  9  14  5  10  15  6  11  16  12  17  18