Tocka lab 1.1

#include<stdio.h>
#include<math.h>
typedef struct point2D {
    double x;
    double y;

}
point2D;
float distance (point2D t1, point2D t2) {


    return sqrt((t1.x-t2.x)*(t1.x-t2.x)+(t1.y-t2.y)*(t1.y-t2.y));

}
typedef struct point3D {
    double x;
    double y;
    double z;
}
point3D;
float distance3D(point3D t1, point3D t2) {

    return sqrt((t1.x-t2.x)*(t1.x-t2.x)+(t1.y-t2.y)*(t1.y-t2.y)+(t1.z-t2.z)*(t1.z-t2.z));

}
int collinear(point2D t1,point2D t2, point2D t3) {
    if((t2.y-t1.y)/(t2.x-t1.x)==(t3.y-t2.y)/(t3.x-t2.x))
        return 1;
    else
        return 0;

}
int main() {
    float x1, y1, x2, y2;
    scanf("%f %f", &x1, &y1);
    scanf("%f %f", &x2, &y2);
    point2D t1 = { x1, y1 };
    point2D t2 = { x2, y2 };
    printf("%.2f\n", distance(t1, t2));
    float z1, z2;
    scanf("%f %f", &z1, &z2);
    point3D t3 = {x1, y1, z1};
    point3D t4 = {x2, y2, z2};
    printf("%.2f\n", distance3D(t3, t4));
    point2D t5 = {z1, z2};
    printf("%d\n", collinear(t1, t2, t5));
    return 0;
}