Search an element in 2D matrix

Posted on Apr 25, 2020

C program to search an element in 2D matrix.

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 search(int mat[MAX][MAX], int row, int col, int num)
{
    int i, j, flag;
    flag = 0;
    for(i=0;i<row;i++)
    {
        for(j=0;j<col;j++)
        {
            if(mat[i][j] == num)
            {
                printf("\nElement found at position (%d,%d)",i,j);
                flag = 1;
            }
        }
    }
    if(flag == 0)
    {
        printf("\nElement not found");
    }
}

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

    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("Enter the number to be searched\t:");
    scanf("%d",&num);

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

    search(mat, row, col, num);

    getch();
}

Output

********** Run1 ********** 

Enter the number of rows        :3
Enter the number of columns     :4
Enter the elements of the matrix
Element [0][0]  :1
Element [0][1]  :2
Element [0][2]  :3
Element [0][3]  :4
Element [1][0]  :5
Element [1][1]  :5
Element [1][2]  :6
Element [1][3]  :7
Element [2][0]  :8
Element [2][1]  :9
Element [2][2]  :10
Element [2][3]  :5
Enter the number to be searched :5

Matrix entered is
1       2       3       4
5       5       6       7
8       9       10      5

Element found at position (1,0)
Element found at position (1,1)
Element found at position (2,3)


********** Run2 ********** 

Enter the number of rows        :3
Enter the number of columns     :4
Enter the elements of the matrix
Element [0][0]  :1
Element [0][1]  :2
Element [0][2]  :3
Element [0][3]  :4
Element [1][0]  :4
Element [1][1]  :3
Element [1][2]  :2
Element [1][3]  :1
Element [2][0]  :1
Element [2][1]  :2
Element [2][2]  :2
Element [2][3]  :3
Enter the number to be searched :5

Matrix entered is
1       2       3       4
4       3       2       1
1       2       2       3

Element not found