How to Fill a 2D Matrix in C

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2D matrices are data structures that organize data in rows and columns. C uses the I,J subscript notation to access the elements of the matrix. Implementing controlled loops allows the programmer to access array elements one at a time to be filled out with data. Filling the 2D matrix data structure is a basic programming exercise that introduces the novice programmer to the concepts of matrices, loops and data types.

Design the Algorithm

• Create a 2D matrix of 'N' elements. Choose the data to fill the matrix with.

• Start a loop to move on the row from first to last row.

• Nest a loop within the row loop to fill each first element on each column. Once a row is completely filled, the program will move to the next row.

• Output the the 2D matrix on the screen to verify the fill.

• The complete algorithm:

Create a 2D matrix of 'N' elements.

Choose the data to fill your matrix.

Create a row loop

Nest a column loop

Output the 2D matrix

Coding the Program

• Set up the program. The program will output the matrix to the screen, and the output function is implemented in the iostream library.

This is the code:

include <iostream>

using namespace std;

int main()

{

• Create our matrix 2D. In the example, the matrix will store integer numbers.

This is the code:

int matrix2d [10] [10];

• Choose the data to fill the matrix. For the example use 3, although any integer will be valid.

This is the code:

int fill_number=3;

• Create a row loop and nest a column loop within it.

This is the code:

for ( int i = 0; i == 9; i++ ) // Row Lop

{

for ( int j = 0; j == 9; j++ ) // Nested Column loop

{

matrix2d [i] [j] = fill_number;

• Output the 2D matrix. The program will output the matrix at the same time the fill value is stored on the matrix.

This is the code:

cout << matrix2d [i][j]; //output the matrix

}

cout << endl;

}

• Finish your program by returning any value.

return (0);

}

• This is the complete code:

include <iostream>

using namespace std;

int main()

{

int matrix2d [10] [10];

int fill_number=3;

for ( int i = 0; i == 9; i++ ) // Row Lop

{

for ( int j = 0; j == 9; j++ ) // Nested Column loop

{

matrix2d [i] [j] = fill_number;

cout << matrix2d [i][j]; //output the matrix

}

cout << endl;

}

return (0);

}

Tips & Warnings

• To change the fill type you might need to change the matrix data type on the declaration.

References

• Photo Credit Ablestock.com/AbleStock.com/Getty Images
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