different_size_of_matrix.c

/*

    different_size_of_matrix.c

    Input matrices of different sizes.

    We declare a large matrix M[MAX_SIZE][MAX_SIZE]
    and use as many rows and columns as we need.


    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>

#define MAX_SIZE 1000

// Displays characters of the matrix M[r][c] that has r rows and c columns
void print_matrix( char *text, char M[][MAX_SIZE], int r, int c )
{
    int i, j;

    printf("%s", text );

    for(i=0;i<r;i++) {
        for(j=0;j<c;j++)
            printf(" %c ", M[i][j] );

        printf("\n\n");
    }
    printf("\n");
}

// set all matrix characters M[r][c] that has r rows and c columns to '\0';
void set_all_matrix_elements_to_zero(char M[][MAX_SIZE], int r, int c )
{
    int i, j;

    for(i=0; i<MAX_SIZE; i++)
        for(j=0; j<MAX_SIZE; j++)
            M[i][j] = '\0';
}

// input characters of matrix M[r][c] that has r rows and c columns
void set_matrix_elements(char M[][MAX_SIZE], int r, int c )
{
    int i, j;
    char ch = 'A';

    for(i=0; i<r; i++)
        for(j=0; j<c; j++)
        {
            M[i][j] = ch++;
            //printf(" M[%d][%d] = %c \n", i, j, M[i][j] );

            if( ch > 'Z' )      // reset fill pattern 'A' to 'Z'
                ch = 'A';
        }
}


int main(void)
{
    int r, c;                   // number of rows r and columns c of matrix M[r][c]
    char M[MAX_SIZE][MAX_SIZE]; // matrix of characters M[r][c]

    r = 3;
    c = 5;
    set_matrix_elements(M,r,c);
    print_matrix("\n Matrix is: \n\n", M, r, c );

    r = 5;
    c = 8;
    set_matrix_elements(M,r,c);
    print_matrix("\n Matrix is: \n\n", M, r, c );

    return 0;

} // main()