Print a matrix in wave form

Posted on Apr 26, 2020

C program to print a matrix in wave form.

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_wave(int mat[MAX][MAX], int row, int col)
{
    int i, j, dir;

    j = 0;
    dir = 1; //wave direction down, 0 for up

    while(j < col)
    {
        if(dir == 1)
        {
            for(i=0;i<row;i++)
            {
                printf("%d  ",mat[i][j]);
            }
            dir = 0;
            j++;
        }
        else
        {
            for(i=row-1;i>=0;i--)
            {
                printf("%d  ",mat[i][j]);
            }
            dir = 1;
            j++;
        }
    }
}

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 wave form is \n");
    print_wave(mat, row, col);

    getch();
}

Output

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