examen prog

//header

#ifndef EXAMEN_H_
#define EXAMEN_H_

struct _PUNCT{
    double x,y;
};
typedef struct _PUNCT PUNCT;
struct _PITICI{
    unsigned int np;
    PUNCT *cc;
};
typedef struct _PITICI PITICI;
PITICI citireStructura(FILE*in);
void afisarePitici(PITICI P);
int semn(PUNCT P,double a,double b, double c);
int verificare(PITICI P,double a, double b, double c);

#endif /* EXAMEN_H_ */

//c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"examen.h"

PITICI citireStructura(FILE*in)
{
    PITICI P;
    int i;
    fscanf(in,"%d",&P.np);
    P.cc=(PUNCT *)calloc(P.np,sizeof(PUNCT));
    if(P.cc==0)
    {
        fprintf(stderr,"Memorie insuficenta.\n");
        exit(EXIT_FAILURE);
    }
    for(i=0;i<P.np;i++)
    {
        fscanf(in,"%lf",&P.cc[i].x);
        fscanf(in,"%lf",&P.cc[i].y);
    }
    return P;
}
void afisarePitici(PITICI P)
{
    int i;
    for(i=0;i<P.np;i++)
    {
        fprintf(stdout,"(%.1lf ,%.1lf)   ",P.cc[i].x,P.cc[i].y);
    }
    fprintf(stdout,"\n");
}
int semn(PUNCT P,double a,double b, double c)
{
    int ok;
    ok=a*P.x+b*P.y+c;
    if(ok>0)
    {
        return 1;
    }
    else
    {
        if(ok==0)
        {
            return 0;
        }
        else
        {
            return -1;
        }
    }
}
int verificare(PITICI P,double a, double b, double c)
{
    int ok,i;
    for(i=0;i<P.np;i++)
    {
        if(semn(P.cc[i],a,b,c)==semn(P.cc[i+1],a,b,c))
            ok=1;
        else
            ok=0;
    }
    return ok;
}

//main

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"examen.h"
int main(void)
{
    FILE*in;
    int s,i,ok;
    double x1,y1,x2,y2;
    double a,b,c;
    in=fopen("intrare.txt","r");
    if(in==0)
    {
        fprintf(stderr,"eroare la deschiderea fisierului intrare.txt.\n");
        exit(EXIT_FAILURE);
    }
    FILE*out;
    out=fopen("iesire.txt","w");
    if(out==0)
    {
        fprintf(stderr,"eroare la deschiderea fisieerului iesire.txt.\n");
        exit(EXIT_FAILURE);
    }
    PITICI r,al;
    r=citireStructura(in);
    fprintf(stdout,"casutele piticilor cu scufii rosii se gasesc la urm coordonate.\n");
    afisarePitici(r);
    al=citireStructura(in);
    fprintf(stdout,"casutele piticilor cu scufii albastre se gasesc la urm coordonate.\n");
    afisarePitici(al);
    fscanf(in,"%d",&s);
    for(i=1;i<s;i++)
    {

            fscanf(in,"%lf",&x1);
            fscanf(in,"%lf",&y1);
            fscanf(in,"%lf",&x2);
            fscanf(in,"%lf",&y2);

        a=y1-y2;
        b=x2-x1;
        c=x1*y2-x2*y1;
        ok=verificare(r,a,b,c);
        if(ok==1)
        {
            fprintf(stdout,"da-sfetnicul %d ia dat o solutie valida.\n",i);
        }
        else
        {
            fprintf(stdout,"nu-sfetnicul %d nu ia dat o solutie valida.\n",i);
        }

    }

    return 0;
}