Exercice 6 corrigé la surcharge des opérateurs en langage C++

#include <iostream.h>
#include <math.h>
class operation{
float num;
float deno;
public:
operation(float numerateur=1, float denominateur=1);
friend operation operator+(operation fct1, operation fct2);
friend operation operator-(operation fct1, operation fct2);
friend operation operator* (operation fct1, operation fct2);
friend operation operator/(operation f1, operation f2);
friend operation operator~(operation f);
operation operator++(int); //post
operation& operator++(); //pré
operator float();
friend operation operator^(operation op,unsigned &);
friend operation operator^(operation op, int& ex);
void affiche();
};
operation::operation (float numerateur, float denominateur){
num= numerateur;
deno=denominateur;
}
operation operator+ (operation fct1, operation fct2){ //ressemble a constructeur par
copie
operation res;
res.deno= fct1.deno*fct2.deno;
res.num=(fct1.num*fct2.deno)+(fct2.num*fct1.deno);
return res;
}
operation operator- (operation fct1, operation fct2){ //ressemble a constructeur par
copie
operation res;
res.deno= fct1.deno*fct2.deno;
res.num=(fct1.num*fct2.deno)-(fct2.num*fct1.deno);
return res;
}
operation operator* (operation fct1, operation fct2){ //ressemble a constructeur par
copie
operation res;
res.deno= fct1.deno*fct2.deno;
res.num=fct1.num*fct2.num;
return res;
}
operation operator/(operation f1, operation f2) {
operation res;
if(f2.num == 0) {
res.num = 0;
res.deno = 1;
cout << "division par 0 pas possible" << endl;
}
else {
res.deno = f1.deno * f2.num;
res.num = f1.num * f2.deno;
}
return res;
}
operation operator~(operation f){
operation res;
res.num=-f.num;
res.deno=f.deno;
return res;
}
operation& operation::operator ++(){
num++;
deno++;
return *this;
}
operation operation::operator ++(int){
operation tmp=*this;
tmp.num++;
tmp.deno++;
return tmp;
}
operation::operator float(){
float res=num/deno;
return res;
}
operation operator^(operation op, unsigned& ex){
operation tmp;
tmp.num=pow(op.num,ex);
tmp.deno=pow(op.deno,ex);
return tmp;
}
operation operator^(operation op, int& ex){
operation tmp;
tmp.num=pow(op.num,ex);
tmp.deno=pow(op.deno,ex);
return tmp;
}
void operation::affiche(){
cout<<num<<" / "<<deno<<endl;
}
// surcharge de l'opérateur << --> voir les exo précédents
void main(){
operation a(2,3);
operation b(2,5);
operation c;
c=a+b;
c.affiche();
c=a-b;
c.affiche();
c=a*b;
c.affiche();
c=a/b;
c.affiche();
c=~a;
c.affiche();
c=a++;
c.affiche();
a.affiche();
c=++a;
c.affiche();
a.affiche();
float h;
h=float(a);
cout<<"conversion "<<h<<endl;
unsigned int g=4;
c=operator^(b,g);
c.affiche();
int j=(-4);
c=operator^(b,j);
c.affiche();
}