Multiple catch block vs generic catch block

[Kourosh23]

Personal contribution:

 // Multiple catch block:
  
// Program to explain how to use multiple catch blocks.

#include <iostream>
using namespace std;


void test(int x){
   try{
       
      if(x==0){ throw 'B'; }
      else if(x == 1){ throw x; }
      else if(x == 2){ throw 1.0;}
      else if(x == 3){ throw "Hello";}
      
      cout << "\nEnd of try-block.";
   }
      catch(char c){ cout << "caught a char: " << c; }
      catch(int i){ cout << "caught an int: " << i; }
      catch(double d){ cout << "caught a double: " << d;}
      catch(const char* s){ cout << s;}
   
   cout << "\nEnd of try-catch system. \n\n";
}


int main(){

cout << "\nTesting Multiple catches: \n" << endl << endl;

cout << "x == 0\n";
test(0);

cout << "x == 1\n";
test(1);

cout << "x == 2\n";
test(2);

cout << "x == 3\n";
test(3);

cout << "x == 4\n";
test(4);

cout << "END. \n";

   return 0;
}

Testing Multiple catches: 


x == 0
caught a char: B
End of try-catch system. 

x == 1
caught an int: 1
End of try-catch system. 

x == 2
caught a double: 1
End of try-catch system. 

x == 3
Hello
End of try-catch system. 

x == 4

End of try-block.
End of try-catch system. 

END. 

// Generic catch block:

// Program to explain how to use multiple catch blocks.

#include <iostream>
using namespace std;


void test(int x){
   try{
      if(x==0){ throw 'B'; }
      else if(x == 1){ throw x; }
      else if(x == 2){ throw 1.0;}
      else if(x == 3){ throw "Hello";}
      cout << "\nEnd of try-block.\n";
   }
      catch(...){
         cout << "Exception caught!\n";
      }
      cout << "End of try-catch block.\n\n";
}


int main(){

cout << "\nTesting Multiple catches: \n" << endl << endl;

cout << "x == 0\n";
test(0);

cout << "x == 1\n";
test(1);

cout << "x == 23\n";
test(2);

cout << "x == 3\n";
test(3);

cout << "x == 4\n";
test(4);

cout << "END. \n";

   return 0;
}

Testing Multiple catches: 


x == 0
Exception caught!
End of try-catch block.

x == 1
Exception caught!
End of try-catch block.

x == 23
Exception caught!
End of try-catch block.

x == 3
Exception caught!
End of try-catch block.

x == 4

End of try-block.
End of try-catch block.

END. 

[Handy Andy]

Hello Kourosh23,

Thank you for the input,

Andy

[TheIdeasMan]

Except that there is not a lot of point in placing the trythrow and catch in the same scope. The test function can throw, so enclose the function call (in main) in a try block. The catch would also have to be in main in that case, as it it is main which is handling the exception.

[Kourosh23]

@Handy Andy any time man.

@TheIdeasMan, I see, so you mean that I have to write all my try inside other functions for example void, and then have my catch inside main ?

I guess the point is in throw;, when it happens, catch-block will catch the exception inside main().

[TheIdeasMan]

I guess the point is in throw;, when it happens, catch-block will catch the exception inside main().

Yes, I worded my reply incorrectly.

It is pointless to have the throw and catch in the same scope.