pattern_challenge_v1.c

/*

    pattern_challenge_v1.c

    Task
    https://web.facebook.com/photo.php?fbid=2194948743984354&set=gm.1587094954782682&type=3&theater

    For n=7

    1 * A 2 * B 3
    * A 2 * B 3 *
    A 2 * B 3 * C
    2 * B 3 * C 4
    * B 3 * C 4 *
    B 3 * C 4 * D
    3 * C 4 * D 5

    pattern string is
    1 * A  2 * B  3 * C  4 * D  5 * E  6 * F  7 * G  8 * H  9 * I 1 * A  2 * B  3 * C ...


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

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>
#include <stdlib.h>     // for exit()

// pattern string is
// 1 * A  2 * B  3 * C  4 * D  5 * E  6 * F  7 * G  8 * H  9 * I 1 * A  2 * B  3 * C ...
void make_pattern_string( char pattern_string[], int n )
{
    int i, j=0, k=0;

    for(i=0; i<3*n; i++)
    {
        pattern_string[k++] = '1' + j;
        pattern_string[k++] = '*';
        pattern_string[k++] = 'A' + j;

        if( j < 8 )
            j++;
        else
            j = 0;
    }
/*
    printf("\n Pattern string is: \n\n");

    for(i=0; i<k; i++)
        printf("%c ", pattern_string[i] );

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


void print_pattern( char pattern_string[], int n )
{
    int i, j, k, first_character = 0;

    printf("\n Pattern is: \n\n");

    for(i=0; i<n; i++)
    {
        k = 0;

        for(j=0; j<n; j++)
            printf("%c ", pattern_string[first_character + k++] );

        printf("\n");

        if( first_character < 26 )
            first_character++;
        else
            first_character = 0;
    }
}


int main(void)
{
    char pattern_string[100];
    int n;

    printf("\n Enter number between 1 and 40 , n = ");
    scanf("%d",&n);

    if( n<1 || n>40 )
    {
        printf("\n Number n must be between 1 and 40 ! \n");
        exit(0);
    }

    make_pattern_string(pattern_string, 9);

    print_pattern(pattern_string, n);


    return 0;

} // main()