Print triangles(function)

#include <stdio.h>
#define SIZE 10
//1.pr_it(SIZE,0,1); is it ok to pass magic numbers as arguments?
//0 here opredeljaet border, 1 - order star and space goes first?



void pr_it(int,int,int);//size, border, order(' ','*')

int main()
{
    int i,j;
    pr_it(SIZE,0,1);//last argument is clue of which symbol comes first * or ' '
    pr_it(SIZE,1,1);//middle argument- clue to formula of border-value
    pr_it(SIZE,2,0);
    pr_it(SIZE,3,0);
    printf("\n\n\n");

    return 0;
}
void pr_it(int s,int flag,int order)
{
    int i,j,border;//border between ' ' and '*'
    char c1,c2;
    c1 = (order)? '*':' ';
    c2 = (order)? ' ':'*';

    for(i=0;i<s;i++)
    {
        switch(flag)//gives value to border, accordingly to what have being
        {           //passed to function as flag
            case 0: border = SIZE -i;  break;
            case 1: border = i+1;      break;
            case 2: border = SIZE -i-1;break;
            case 3: border = i;        break;

        }
        for(j=0;j<s;j++)
        {
            printf("%c",j<border? c1: c2);//border is the only complicated value here
        }
        printf("\n");
    }

}