hollow rectangle pattern v1.c

/*
    hollow rectangle pattern v1.c

    Rectangle is defined with two attributes (parameters):

    number of columns (wide) and number of rows (height)

    The beginning of the coordinate system is in the upper left UL corner
    of the window and there is a point (x, y) = (0.0).
    x is column, y is row.

    Characteristic points of window and rectangle are:

    TL top left     (x, y) = ( 0, 0)
    TR top right    (x, y) = (79, 0) = ( MAX_COLUMNS,           0 )
    BL bottom left  (x, y) = (0, 25) = ( 0          ,    MAX_ROWS )
    BR bottom right (x, y) = (79,25) = ( MAX_COLUMNS,    MAX_ROWS )

*/

#include <stdio.h>
#include <time.h>                   // for clock()

#define SECOND 1000                 // time for delay() in milliseconds
#define MAX_COLUMNS 79
#define MAX_ROWS    25


// wait (do nothing) for time in milliseconds
void delay(int milliseconds)
{
    clock_t start_time = clock();   // get start time

    // looping (do nothing) till required time is not acheived
    while ( clock() < start_time + milliseconds )
        ;                           // do nothing
}

// Function to print hollow rectangle with char '*'
// from current cursor position with printf()
// Rectangle is defined by number of columns (wide) and number of rows (height)
void print_hollow_rectangle_printf( int columns, int rows )
{
    int i, j;

    for (i = 1; i <= rows; i++)
    {
        for (j = 1; j <= columns; j++)
        {
            if (i==1 || i==rows || j==1 || j==columns)
                printf("*");
            else
                printf(" ");
        }
        printf("\n");
    }
}

// Function to print hollow rectangle with char '*'
// from current cursor position with putchar()
// Rectangle is defined by number of columns (wide) and number of rows (height)
void print_hollow_rectangle_putchar( int columns, int rows )
{
    int i, j;

    for (i = 1; i <= rows; i++)
    {
        for (j = 1; j <= columns; j++)
        {
            if (i==1 || i==rows || j==1 || j==columns)
                putchar('*');
            else
                putchar(' ');
        }
        putchar('\n');
    }
}

// move cursor down howMuchRows from current position
void cursorDown(int howMuchRows)
{
    int i;

    if( howMuchRows < 0 )
        howMuchRows = 0;

    if( howMuchRows > MAX_ROWS )
        howMuchRows = MAX_ROWS;

    for (i = 0; i < howMuchRows; i++)
        putchar('\n');
}

// move cursor right howMuchColumns from current position
// overwrite existing characters on it's way
void cursorRight(int howMuchColumns)
{
    int i;

    if( howMuchColumns < 0 )
        howMuchColumns = 0;

    if( howMuchColumns > MAX_COLUMNS )
        howMuchColumns = MAX_COLUMNS;

    for (i = 0; i < howMuchColumns; i++)
        putchar(' ');
}

// move cursor down to position (x, y) = (column, howMuchRows) from current position
// columns are counting from 0
// rows are counting from current row
// overwrite existing characters on it's way
void cursorGoToFromCurrentColumnRow(int column, int howMuchRows)
{
    int i;

    if( howMuchRows < 0 )
        howMuchRows = 0;

    if( howMuchRows > MAX_ROWS )
        howMuchRows = MAX_ROWS;

    if( column < 0 )
        column = 0;

    if( column > MAX_COLUMNS )
        column = MAX_COLUMNS;

    for (i = 0; i < howMuchRows; i++)   // cursor down
        putchar('\n');

    for (i = 0; i < column; i++)    // cursor right (with overwrithing existing characters)
        putchar(' ');
}


int main()
{
    int i, columns = MAX_COLUMNS, rows = MAX_ROWS;
//    int i, columns = 10, rows = 7;    // square

    // print ruler
    puts("          1         2         3         4         5         6         7        ");
    puts("0123456789012345678901234567890123456789012345678901234567890123456789012345678");

    for (i = 0; i < 1; i++)
    {
        //system("CLS");
                                                // from current cursor position
        print_hollow_rectangle_printf(15, 8);   // wide 15, height 8

        cursorDown(2);

        print_hollow_rectangle_putchar(40, 5);  // wide 20, height 5

        //delay(100);   // wait 100 milliseconds
    }

    return 0;
}