lab_1

---3----
#include<stdio.h>
#include<stdlib.h>
#include<string.h>

typedef struct proizvod{
  char ime[100];
  int cena;
  int kol;
} proi;
int suma(int a,int b)
{
    int vkup=0;
    int i=0;
    for(i=0;i<b;i++)
    {
        vkup+=a;
    }
    return vkup;
}
int main ()
{
    proi proi[100];
    int n;
    int i;
    printf("Vnesete broj na proizvodi:");
    scanf("%d",&n);
    for(i=0;i<n;i++){
    printf("\nVnesete go imeto na proizvodot:");
    scanf("%s",&proi[i].ime);
    printf("\nVnesete ja cenata na proizvodot:");
    scanf("\n%d",&proi[i].cena);
    printf("\nVesete ja kolicinata na proizvodot:");
    scanf("\n%d",&proi[i].kol);
    }
    int cena=0;
    for(i=0;i<n;i++)
    {
    cena+=suma(proi[i].cena,proi[i].kol);
    }
    printf("\nCenata na vasata smetka e:%d",cena);

    return 0;
}

--------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;
 }