Print a matrix diagonally upward

Posted on Apr 26, 2020

C program to print a matrix diagonally upward.

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

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

    for(i=0;i<col-1;i++)
    {
        cur_row = row-1;
        cur_col = i+1;
        while(cur_col < col && cur_row >= 0)
        {
            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_up(mat, row, col);

    getch();
}

Output

Enter the number of rows        :3
Enter the number of columns     :8
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 [0][6]  :7
Element [0][7]  :8
Element [1][0]  :9
Element [1][1]  :10
Element [1][2]  :11
Element [1][3]  :12
Element [1][4]  :13
Element [1][5]  :14
Element [1][6]  :15
Element [1][7]  :16
Element [2][0]  :17
Element [2][1]  :18
Element [2][2]  :19
Element [2][3]  :20
Element [2][4]  :21
Element [2][5]  :22
Element [2][6]  :23
Element [2][7]  :24

Matrix entered is
1       2       3       4       5       6       7       8
9       10      11      12      13      14      15      16
17      18      19      20      21      22      23      24

Matrix in snake from last column form is
1  9  2  17  10  3  18  11  4  19  12  5  20  13  6  21  14  7  22  15  8  23  16  24