Menu Close

Program to display m*n matrix using vector STL in C++

In this tutorial, We are going to learn about matrix representation by using vector STL (Standard Template Library) in C++ language.

There are many ways to create matrix. We will be using vector in given below example.

Method 1:

#include <iostream>
#include <vector>
#include <stdio.h>
using namespace std;

int main()
{
    int row, column, matrix_val;

    cout<<"Enter row size: ";
    cin>>row;

    cout<<"\nEnter column size: ";
    cin>>column;
    
    // Declare vector
    vector<vector<int> > arr(row, vector<int>(column));
    
    for (auto index_1 = 0; index_1 < row ; index_1++) {

        for (auto index_2 = 0; index_2 < column; index_2++){

            printf("\nEnter matrix value for position row: %d, column: %d:  ", index_1, index_2);

            cin>>matrix_val;

            arr[index_1][index_2] = matrix_val;
        }
    }
    // Print matrix
    for (auto index_1 = 0; index_1 < row ; index_1++) {

        for (auto index_2 = 0; index_2 < arr[index_1].size(); index_2++){

            cout<<arr[index_1][index_2]<<" ";

        }
        cout<<"\n";
    }
}

Output:

 Enter row size: 2
Enter column size: 2
Enter matrix value for position row: 0, column: 0: 1
Enter matrix value for position row: 0, column: 1: 2
Enter matrix value for position row: 1, column: 0: 3
Enter matrix value for position row: 1, column: 1: 4
Matrix is:
1 2
3 4

Method 2:

#include <iostream>
#include <vector>
#include <stdio.h>
using namespace std;

int main()
{
    int row, column, matrix_val;

    cout<<"Enter row size: ";
    cin>>row;

    cout<<"\nEnter column size: ";
    cin>>column;
    
    // Declare vector
    vector<vector<int> > arr(row);
    
    for (auto index_1 = 0; index_1 < row ; index_1++) {

        arr[index_1] = vector<int>(column);

        for (auto index_2 = 0; index_2 < column; index_2++){

            printf("\nEnter matrix value for position row: %d, column: %d:  ", index_1, index_2);

            cin>>matrix_val;

            arr[index_1][index_2] = matrix_val;
        }
    }
    // Print matrix
    for (auto index_1 = 0; index_1 < row ; index_1++) {

        for (auto index_2 = 0; index_2 < arr[index_1].size(); index_2++){

            cout<<arr[index_1][index_2]<<" ";

        }
        cout<<"\n";
    }
}

Output:

 Enter row size: 2
Enter column size: 2
Enter matrix value for position row: 0, column: 0: 1
Enter matrix value for position row: 0, column: 1: 2
Enter matrix value for position row: 1, column: 0: 3
Enter matrix value for position row: 1, column: 1: 4
Matrix is:
1 2
3 4

Method 3:

#include <iostream>
#include <vector>
#include <stdio.h>
using namespace std;

int main()
{
    int row, column;

    cout<<"Enter row size: ";
    cin>>row;

    cout<<"\nEnter column size: ";
    cin>>column;
    
    // Declear vector
    vector<vector<int> > arr(row);
    
    for (auto index_1 = 0; index_1 < row ; index_1++) {

        for (auto index_2 = 0; index_2 < column; index_2++){

            printf("\nEnter matrix value for position row: %d, column: %d:  ", index_1, index_2);

            int matrix_val;

            cin>>matrix_val;

            arr[index_1].push_back(matrix_val);

        }
    }
    // Print matrix
    for (auto index_1 = 0; index_1 < row ; index_1++) {

        for (auto index_2 = 0; index_2 < column; index_2++){

            cout<<arr[index_1][index_2]<<" ";

        }
        cout<<"\n";
    }
}

Output:

 Enter row size: 2
Enter column size: 2
Enter matrix value for position row: 0, column: 0: 1
Enter matrix value for position row: 0, column: 1: 2
Enter matrix value for position row: 1, column: 0: 3
Enter matrix value for position row: 1, column: 1: 4
Matrix is:
1 2
3 4

To learn more about golang, Please refer given below link.

https://www.techieindoor.com/go-lang-tutorial/

References:

https://en.wikipedia.org/wiki/C%2B%2B
Posted in C++

Leave a Reply

Your email address will not be published.

Contact Us