Exception with arguments
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1 Exception Handling
2 Introduction : Fundamental Syntax for Exception Handling code : try catch throw Multiple exceptions Exception with arguments
3 Introduction Exception: An abnormal condition that arises in a code sequence at run time. An exception is a run-time error. Exception handling allows us to manage run-time errors in an orderly fashion.
4 Introduction #include <iostream> using namespace std; int main() double a, b, c; // Request two numbers from the user cout << "Please provide two numbers\n"; cout << "First Number: "; cin >> a; cout << "Second Number: "; cin >> b; // Multiply the numbers and display the result c = a * b; cout << "\n" << a << " * " << b << " = " << c << "\n\n"; return 0;
5 Introduction When it comes up, the user is asked to simply type two numbers; the program would use them to perform a multiplication and display the result. Imagine that a user, decides to type the name of a country or somebody s telephone number as one of the requested values. Since a program such as this one is not prepared to multiply two strings or one number to a string it would not know what to do.
6 Introduction The only alternative the compiler would have is to send the problem to the operating system, hoping that the OS would know what to do. Whenever the compiler is handed a task, it would try to perform the assignment. If it can t perform the assignment, for any reason it is not prepared for, it would throw an error. As a programmer, if you can anticipate the type of error that could occur in your program, you can catch the error yourself and deal with it by telling the compiler what to do when this type of error occurs.
7 Introduction An exception is a situation that would be unusual for the program that is being processed. An error result or an unpredictable behavior on your program not caused by the operating system but that occurs in your program is called an exception. The ability to deal with a program s eventual abnormal behavior is called exception handling.
8 Introduction Using exception handling, our program can automatically invoke an error-handling routine when an error occurs. C++ exception handling is built upon three keywords: try, catch, and throw.
9 The Basics try identifies a code block where exception can occur throw causes an exception to be raised (thrown) catch identifies a code block where the exception will be handled (caught) try throw an exception catch the exception 9
10 Exception Handling Fundamentals..try Error prone program statements that we may want to monitor for generation of exceptions are contained in a try block. Syntax: try // try block
11 Exception Handling Fundamentals..try When an exception is thrown, the remaining code in the try block is skipped, just as in the case of the return statement in a function, and every auto object created after the try block is entered, is destroyed automatically The thrown object is caught by the catch block where the execution continues Then, the execution continues with the next statement after the catch block
12 Exception Handling Fundamentals throw If an exception (i.e., an error) occurs within the try block, then that exception is thrown using throw. Syntax: throw exception; If an exception is to be caught, then throw must be executed either from within a try block or from any function called from within the try block (directly or indirectly).
13 Exception Handling Fundamentals catch The thrown exception is caught, using catch block and processed. Syntax: catch (type argument) // catch block
14 Catching Exceptions You must supply at least one catch block for a try block Otherwise compiler error (let's see it in ExceptionSample1.cpp). int main() int height; cin >> height; try if (height > 300) throw "height exceeds maximum"; if (height < 30) throw "height below minimum"; cout << "Person is " <<ToInches(height) << "inches tall" << endl; //NO CATCH HERE NOT ALLOWED return 0;
15 return 0; Catching Exceptions Catch blocks must immediately follow the try block without any program code between them. Otherwise, compiler error (let's see it in ExceptionSample1.cpp). int main() int height; cin >> height; try if (height > 300) throw "height exceeds maximum"; if (height < 30) throw "height below minimum"; cout << "Person is " <<ToInches(height) << "inches tall" << endl; cout << "Wassup"; //no statements are allowed between try and catch catch(const char msg[]) cout << "Exception occured: "<< msg << endl; cout << "Program Stops " << endl;
16 try Program statements requires monitor for exceptions catch( type argument ) Program statements handles for Exception
17 try Program statements requires monitor for exceptions catch( type1 argument ) catch( type2 argument ) catch( typen argument ) Program statements handles Program for Exception statements handles for Exception Program statements handles for Exception
18 Using try & catch try int d = 0; int a = 30 / d; throws Arithmetic Exception catch(int e ) printf("division by zero.");
19 Syntax for Exception Handling Code : try-catch Combined with the try block, the syntax of an exception would be: try.. throw exception; catch(argument) // Catch the exception
20 Exception Handling Fundamentals NOTE: Throwing an unhandled exception causes the standard library function terminate() to be invoked. By default, terminate() calls abort() to stop your program.
21 Code : try- catch-throw #include <iostream> using namespace std; int main() int StudentAge; cout << Enter Student Age: "; cin >> StudentAge; try if(studentage < 0) throw; cout << "\nstudent Age: " << StudentAge << "\n\n";
22 catch(...) cout << "\n"; return 0; Code : try- catch-throw catch (...) is used to catch any unhandled exception
23 If positive integer is given as input Output : Enter Student Age: 1 Student Age: 1 Output If negative integer is given as input Output : Enter Student Age: -1 Program will give an abnormal termination error
24 Code : try- catch-throw #include <iostream> using namespace std; int main() double Number1, Number2, Result; // Request two numbers from the user cout << "Please provide two numbers\n";
25 Code : try- catch-throw try cout << "First Number: "; cin >> Number1; cout << "Second Number: "; cin >> Number2; if( Number2 == 0 ) throw (Number2); // Perform a division and display the result Result = Number1 / Number2; cout << "\n" << Number1 << " / " << Number2 << " = " << Result << "\n\n";
26 Code : try- catch-throw catch(int i) cout<< Exception caught : x = <<x<< \n ; return 0;
27 Output Please provide two numbers First Number: Second Number: / 5.52 = Number Number2: 5.52 Result
28 Output Please provide two numbers First Number: Second Number: 0 Exception caught : x=0
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