#include <stdio.h>
#include <math.h>
#include <stdbool.h>
 
bool porownaj(double a, double b)
{
    const double eps=1e-9;
    return fabs(a-b) < eps;
}
 
// punkty ze strony: http://m...content-available-to-author-only...z.pl/strona/2510.html --> sa WSPOLINIOWE
void wyznacznik()
{
    float x1=2, y1=1, x2=4, y2=5, x3=-3, y3=-9;
    float det = (x1*y2*1.0) + (y1*1.0*x3) + (1.0*x2*y3);
    printf("WYSZEDL MI NIEPOPRAWNY DET=%f\nMUSZE SPRAWDZIC ROWNANIA BO SA DO BANI\n",det);
    if(porownaj(fabs(det), 0.0))
        printf("pkty wspoliniowe\n");
}
 
int main()
{
    wyznacznik();
    return 0;
}

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