#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdlib.h>

typedef struct
{
    int num,numit; //numitorul>0
} Rational;
Rational citesteFractie()
{
    Rational f;
    do{
        printf("p/q: ");
        fflush(stdin);
    }while(scanf("%d/%d",&f.num,&f.numit)<2||f.numit==0);
    if(f.numit<0)// 2/-3=-2/3
    {f.num=-f.num;
        f.numit=-f.numit;
}
simplifica(&f);
return f;
}

int cmmdc(int a,int b)
{
    int
}
void simplifica(Rational *pf)
{
    int c=cmmdc(abs(pf->num),abs(pf->numit));
    pf-> num/=c;
    pf-> numit /=c;
}
Rational aduna(Rational f1,Rational f2)
{
    Rational r;
    r.num=f1.num*f2.numit+f1.numit*f2.num;
    r.numit=f1.numit*f2.numit;
    simplifica(&r);
    return r;

}

void afis(Rational f)
{
    printf("%d",f.num);
    if(f.num!=0 && f.numit!=1)
    printf("/%d",f.numit);
}
int main()
{
    Rational f1,f2,r;
    printf("Prima fractie: \n");
    f1=citesteFractie();
    printf("A doua fractie: \n");
    f2=citesteFractie();
    r=aduna(f1,f2);
    afis(f1);
    printf("+");
    afis(f2);
    printf("=");
    afis(r);
}