c++异常处理机制

#include<iostream>
using namespace std;
double divide(double,double);
int main(){
    double f1=0.0,f2=0.0;
    try{
        cout<<"f1/f2="<<divide(f1,f2)<<endl;
    }
    catch(double){
        cout<<"被0除"<<endl;
    }
    return 0;
}
double divide(double x,double y){
    if(y==0)
        throw 0.0;
    return x/y;
}

#include<iostream>
using namespace std;
class OutOfBounds{
public:
    OutOfBounds(int a){
        i=a;
    }
    int indexValue(){
        return i;
    }
private:
    int i;
};
class Array{
public:
    int &operator[](int i){
        if(i<0||i>=10){
            throw OutOfBounds(i);
            return a[i];
        }
    }
private:
    int a[10];
};
int main(){
    Array a;
    try{
        a[3]=30;
        cout<<"a[3]  "<<a[3]<<endl;
        a[100]=100;
        cout<<"a[100]"<<a[100]<<endl;
    }
    catch(OutOfBounds error){
        cout<<"Subscript value "<<error.indexValue()<<" out of bounds.\n";
    }
    return 0;
}

#include<iostream>
using namespace std;
void h(){
    throw 0;
}
void g(){
    try{
        h();
    }
    catch(int){
        cout<<"Catch in g\n";
        throw;
    }
}
int main(){
    try{
        g();
    }
    catch(int){
        cout<<"Catch in main\n";
    }
    
    return 0;
}

#include<iostream>
#include <exception>
using namespace std;

int main(){
    try{
        exception theError;//声明一个标准c++异常类exceptio的对象
        throw(theError);//抛出该异常类的对象
    }
    catch(const exception &theError){//捕捉标准c++异常类的对象
        cout<<theError.what()<<endl;//用waht成员函数显示出错原因
    }
    try{
        logic_error theLogicError("Logic Error!");//声明一个标准c++异常类logic_error的对象
        throw(theLogicError);//抛出该异常类的对象
    }
    catch(const exception &theLogicError){//捕捉标准c++异常类的对象
        cout<<theLogicError.what()<<endl;//用waht成员函数显示出错原因
    }
    return 0;
}