hourglass_numbers_pattern_v1.c

/*

    hourglass_numbers_pattern_v1.c

 Hourglass pattern with abs() and longest row.

 The number of stars in the longest row of hourglass is same as
 the number of rows of the upper triangle of hourglass.

 Hourglass will have 2*n-1 rows.

 Example: nr = 4

*-*-*-*-*-*-*-
--*-*-*-*-*-
----*-*-*-
------*-
----*-*-*-
--*-*-*-*-*-
*-*-*-*-*-*-*-

row  spaces     *          r

 0.     0       7         -3
 1.     1       5         -2
 2.     2       3         -1
 3.     3       1          0
 4.     2       3          1
 5.     1       5          2
 6.     0       7          3


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

    https://pastebin.com/u/dmilicev

*/

#include "stdio.h"
#include "stdlib.h"     // for function abs()

/*
*******
-*****
--***
---*
--***
-*****
*******
*/
void hourglass_of_stars_v11(int n){
// n - number of rows in upper triangle of hourglass

    int r, c;   // r - row, c - column

    for (r = -n+1; r < n; r++){             // loop for rows
        for (c = 0; c < n-abs(r)-1; c++)    // print "-"
            printf("-");

        for (c = 0; c < 2*abs(r)+1; c++)    // print "*"
            printf("*");

        printf("\n");                       // new row
    }
}

/*
*-*-*-*-*-*-*-
--*-*-*-*-*-
----*-*-*-
------*-
----*-*-*-
--*-*-*-*-*-
*-*-*-*-*-*-*-
*/
void hourglass_of_stars_v12(int n){
// n - number of rows in upper triangle of hourglass

    int r, c;   // r - row, c - column

    for (r = -n + 1; r < n; r++){               // loop for rows
        for (c = 0; c < n-abs(r)-1; c++)        // print "--"
            printf("--");

        for (c = 0; c < 2*abs(r)+1; c++)        // print "*-"
            printf("*-");

        printf("\n");                           // new row
    }
}

/*
1234321
-12321
--121
---1
--121
-12321
1234321
*/
void hourglass_of_numbers_v211(int n){
// n - number of rows in upper triangle of hourglass
    int r, c, num;  // r - row, c - column, num - current number

    for (r = -n+1; r < n; r++){             // loop for all rows of the hourglass
        for (c = 0; c < n-abs(r)-1; c++)    // print blanks "-"
            printf("-");

        num = 1;

        for (c = 0; c < 2*abs(r)+1; c++){   // print numbers
            if( c<abs(r) )
                printf("%d", num++);
            else
                printf("%d", num--);
        }

        printf("\n");                       // new row
    }
}

/*
1-2-3-4-3-2-1-
--1-2-3-2-1-
----1-2-1-
------1-
----1-2-1-
--1-2-3-2-1-
1-2-3-4-3-2-1-
*/
void hourglass_of_numbers_v212(int n){
// n - number of rows in upper triangle of hourglass
    int r, c, num;  // r - row, c - column, num - current number

    for (r = -n+1; r < n; r++){             // loop for all rows of the hourglass
        for (c = 0; c < n-abs(r)-1; c++)    // print blanks "--"
            printf("--");

        num = 1;

        for (c=0; c<2*abs(r)+1; c++){       // print numbers
            if( c<abs(r) )
                printf("%d-", num++);
            else
                printf("%d-", num--);
        }

        printf("\n");                       // new row
    }
}

/*
4321234
-43234
--434
---4
--434
-43234
4321234
*/
void hourglass_of_numbers_v221(int n){
// n - number of rows in upper triangle of hourglass
    int r, c, num;  // r - row, c - column, num - current number

    for (r = -n+1; r < n; r++){             // loop for all rows of the hourglass
        for (c = 0; c < n-abs(r)-1; c++)    // print blanks "-"
            printf("-");

        num = n;

        for (c = 0; c < 2*abs(r)+1; c++){   // print numbers
            if( c < abs(r) )
                printf("%d", num--);
            else
                printf("%d", num++);
        }

        printf("\n");                       // new row
    }
}

/*
4-3-2-1-2-3-4-
--4-3-2-3-4-
----4-3-4-
------4-
----4-3-4-
--4-3-2-3-4-
4-3-2-1-2-3-4-
*/
void hourglass_of_numbers_v222(int n){
// n - number of rows in upper triangle of hourglass
    int r, c, num;  // r - row, c - column, num - current number

    for (r = -n+1; r < n; r++){             // loop for all rows of the hourglass
        for (c = 0; c < n-abs(r)-1; c++)    // print blanks "--"
            printf("--");

        num = n;

        for (c = 0; c < 2*abs(r)+1; c++){   // print numbers
            if( c < abs(r) )
                printf("%d-", num--);
            else
                printf("%d-", num++);
        }

        printf("\n");                       // new row
    }
}


int main(void)
{
    int n=4;    // n - number of rows of the upper triangle of hourglass

    printf("\n 1.1 \n\n");
    hourglass_of_stars_v11(n);

    printf("\n 1.2 \n\n");
    hourglass_of_stars_v12(n);

    printf("\n 2.1.1 \n\n");
    hourglass_of_numbers_v211(n);

    printf("\n 2.1.2 \n\n");
    hourglass_of_numbers_v212(n);

    printf("\n 2.2.1 \n\n");
    hourglass_of_numbers_v221(n);

    printf("\n 2.2.2 \n\n");
    hourglass_of_numbers_v222(n);

    return 0;
}