Programming exception
From Wikipedia, the free encyclopedia
In computer programming, a programming exception occurs when an error is discovered during the course of programming. The most commonly known one is a divide by zero error, meaning that a statement like
C code -------
{
A=0; C = B/A;
}
end of code ---
is encountered (usually by the compiler or OS).
In the early days, the computer would usually crash, or return the user to the OS. With the advent of Structured Exception Handling (SEH), a programmer has the ability to compartmentalize the error to a certain scope in his code. The mechanism for compartmentalizing the code is the try/catch block. Hence in a segment of C code
C code ---------
{
try {
A=0;
C = B/A;
} catch (...) {
printf("A is zero!");
}
}
end of code ---
one has the ability to structure the programming behavior and even suppress certain types of errors without subverting the original compilers design intent through the use of C/UNIX signals. However, with structured programming handling, one has the ability to define new exceptions based on a user's definition of an exception. For example, the user can introduce a new exception which he defines.
C code ---------
{
Exception DivideByZeroIntException;
try {
int iB, iC, iA=0;
if (0 == iA) throw DivideByZeroIntException;
iC = iB/iA;
} catch (DivideByZeroIntException) {
printf("A is zero!\n");
} catch (...) {
printf("something else is wrong\n");
} finally {
printf("A=%d", iA)
}
}
end of code ---
