ЛВ1 СЕМ2

Задача 1:
-------------
#include <stdio.h>
#include <math.h>

typedef struct tocka2D {
    double x;
    double y;
} tocka2D ;

typedef struct tocka3D
{
    double x;
    double y;
    double z;
} tocka3D;

float rastojanie ( tocka2D t1 , tocka2D t2) {
    return sqrt (( t1.x - t2.x) * (t1.x - t2.x) + (t1.y - t2.y) * (t1.y - t2.y));
}

float rastojanie3D ( tocka3D t1 , tocka3D 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));
}

void ista_prava ( tocka2D t1 , tocka2D t2 , tocka2D t3) {
    if( (t2.y-t1.y)/(t2.x-t1.x) == (t3.y-t2.y)/(t3.x-t2.x) )
        printf("Tockite se na ista prava.");
    else
        printf("Tockite ne se na ista prava.");
}

int main () {
    tocka2D t1 = { 4.54 , -7.35 };
    tocka2D t2 = { -3.76 , 10.45 };
    printf (" Rastojanieto pomegu tockite t1 i t2 e: %.2f\n", rastojanie (t1 , t2));
return 0;
}

Задача 2:
--------------
#include <stdio.h>

int ccw(int a, int b, int c, int d, int e, int f){
if (((f-b)*(c-a)) > ((d-b)*(e-a))) return 0;
return 1;
}

int main() {
int a,b,c,d,e,f,g,h;
scanf("%d %d %d %d %d %d %d %d", &a, &b, &c, &d, &e, &f, &g, &h);

if(ccw(a,b,e,f,g,h)==ccw(c,d,e,f,g,h)) printf("no");
else if(ccw(a,b,c,d,e,f)==ccw(a,b,c,d,g,h)) printf("no");
else printf("yes");
return 0;
}

Задача 3:
-------------
#include<stdio.h>
typedef struct proizvod
{
char ime[20];
int cena;
int kolicina;
}proizvod;
int main()
{
int i,n;
proizvod p[20];
printf("Broj na proizvodi\n");
scanf("%d", &n);
for(i=0;i<n;i++)
{
printf("Ime: ");
scanf("%s", &p[i].ime);
printf("Cena: ");
scanf("%d", &p[i].cena);
printf("Kolicina: ");
scanf("%d", &p[i].kolicina);
}
int vkupno=0;
for(i=0;i<n;i++)
{
vkupno+=p[i].kolicina*p[i].cena;
}
printf("Vkupno: %d", vkupno);
return 0;
}