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Gestion des exceptions C ++
Selon le type de données de l'exception lancée, entrez le bloc catch correspondant
void main(){
try{
int age = 300;
if (age > 200){
throw 9.8;
}
}
catch (int a){
cout << "int异常" << endl;
}
catch (char* b){
cout << b << endl;
}
catch (...){
cout << "未知异常" << endl;
}
system("pause");
}
jeter en dehors de la fonction
void mydiv(int a, int b){
if (b == 0){
throw "除数为零";
}
}
void func(){
try{
mydiv(8, 0);
}
catch (char* a){
throw a;
}
}
void main(){
try{
func();
}
catch (char* a){
cout << a << endl;
}
system("pause");
}
Lancer un objet
Classe d'exception
class MyException{
};
void mydiv(int a, int b){
if (b == 0){
throw MyException();
//throw new MyException; //不要抛出异常指针
}
}
void main(){
try{
mydiv(8,0);
}
catch (MyException& e2){
cout << "MyException引用" << endl;
}
//会产生对象的副本
//catch (MyException e){
// cout << "MyException" << endl;
//}
catch (MyException* e1){
cout << "MyException指针" << endl;
delete e1;
}
system("pause");
}
throw déclare le type d'exception que la fonction lancera
void mydiv(int a, int b) throw (char*, int) {
if (b == 0){
throw "除数为零";
}
}
Exception standard (similaire à JavaNullPointerException)
class NullPointerException : public exception{
public:
NullPointerException(char* msg) : exception(msg){
}
};
void mydiv(int a, int b){
if (b > 10){
throw out_of_range("超出范围");
}
else if (b == NULL){
throw NullPointerException("为空");
}
else if (b == 0){
throw invalid_argument("参数不合法");
}
}
void main(){
try{
mydiv(8,NULL);
}
catch (out_of_range e1){
cout << e1.what() << endl;
}
catch (NullPointerException& e2){
cout << e2.what() << endl;
}
catch (...){
}
system("pause");
}
Exception externe
class Err{
public:
class MyException{
public:MyException(){
}
};
};
void mydiv(int a, int b){
if (b > 10){
throw Err::MyException();
}
}