Catch double exception
#include <iostream>
using namespace std;
int main(void)
{
try {
cout << "Inside try block." << endl;
throw 100;
cout << "This will not execute.";
}catch(double d) {
cout << "Caught a double exception -- value is: ";
cout << d << endl;
}
}Catching class type exceptions
#include <iostream>
#include <cstring>
using namespace std;
class MyException {
public:
char message[80];
int what;
MyException() { *message = 0; what = 0; }
MyException(char *s, int e) {
strcpy(message, s);
what = e;
}
};
int main()
{
int i;
try {
cout << "Enter a positive number: ";
throw MyException("Not Positive", -1);
}
catch (MyException e) { // catch an error
cout << e.message << ": ";
cout << e.what << "\n";
}
return 0;
}Enter a positive number: Not Positive: -1
Catching Class Types
#include <iostream>
#include <cstring>
using namespace std;
class MyException {
public:
char str_what[80];
int what;
MyException() { *str_what = 0; what = 0; }
MyException(char *s, int e) {
strcpy(str_what, s);
what = e;
}
};
int main(){
int i;
try {
cout << "Enter a positive number: ";
cin >> i;
if(i<0)
throw MyException("Not Positive", i);
}
catch (MyException e) { // catch an error
cout << e.str_what << ": ";
cout << e.what << "\n";
}
return 0;
}Different types of exceptions can be caught
#include <iostream>
using namespace std;
void f(int test)
{
try{
if(test)
throw test;
else
throw "Value is zero";
}
catch(int i) {
cout << "Caught Exception #: " << i << "\n";
}
catch(const char *str) {
cout << "Caught a string: ";
cout << str << "\n";
}
}
int main()
{
cout << "Start\n";
f(1);
f(2);
f(0);
f(3);
cout << "End";
return 0;
}Start
Caught Exception #: 1
Caught Exception #: 2
Caught a string: Value is zero
Caught Exception #: 3
End"
how to restrict the types of exceptions that can be thrown from a function.
#include <iostream>
using namespace std;
void Xhandler(int test) throw(int, char, double){
if(test==0) throw test;
if(test==1) throw "a";
if(test==2) throw 123.23;
}
int main()
{
cout << "start\n";
try{
Xhandler(0);
}
catch(int i) {
cout << "Caught an integer\n";
}
catch(char c) {
cout << "Caught char\n";
}
catch(double d) {
cout << "Caught double\n";
}
cout << "end";
return 0;
}
