simple star-o pattern v1 .c

/*
 simple star-o  pattern v1 .c

oooooooooo
*********
oooooooo
*******
oooooo
*****
oooo
***
oo
*

*/

#include "stdio.h"

int main(void)
{
/*
    i       for loop counter,
    r       row,
    nr      number_of_rows,
    no      number_of_o,
    na      number_of_*
*/
    int i, r, nr, no, na;

    printf("\n Enter number of rows, nr = ");
    scanf("%d", &nr);           // try 10

    no = nr;                    // initial value
    na = nr-1;                  // initial value

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

    for (r=0; r<nr/2; r++)      // repeat nr/2 times
    {                           // print two rows at once, that is why r<nr/2
        for (i=0; i<no; i++)    // print first row with "o", no times
            printf("o");

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

        for (i=0; i<na; i++)    // print second row with "*", na times
            printf("*");

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

        no = no-2;              // new numbers of "o" for next first row repeat
        na = na-2;              // new numbers of "*" for next second row repeat
    }

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

    return 0;
}