C + + tips for throwing exceptions

The C + + language, like other programming languages, also contains handling of exceptions. Here we will give you a detailed explanation of C + + throw exception implementation methods, and the application of exceptions. I hope that we can get some help to improve the understanding of this.

C + + throws an exception (also known as discarding an exception) that detects whether an exception is generated, in C + +, which is implemented by the throw statement, and throws an exception if an exception is detected. The format of the statement is:

throw-expression;

If an exception is found in the program segment of the TRY statement block, including the function in which it was called, and the exception is discarded, the exception can be caught and processed by a catch statement after the try statement block, and the condition that is caught and processed is that the type of the thrown exception matches the exception type of the catch statement. Because C + + uses data types to differentiate between different exceptions, the value of the expression in the throw statement has no practical significance when judging the exception, and the type of the expression is particularly important.

Handles an exception with a divisor of 0. The example uses the Try/catch statement to catch an exception with the above divisor of 0, and use the throw statement to implement C + + to throw an exception, implementing exception handling, as shown in the code listing.

#include//contains header file #include double fuc (double x, double y)//define function

{if (y==0)

{throw y;//divisor is 0, throw exception}

return x/y; Otherwise return two number of quotient}

void Main ()

{double res; try//define exception

{res=fuc (2,3); cout<< "The result of X/y is:" <<res<<endl; p= ""}<= "" exception = "" Res= "fuc (4,0);" >

catch (double)//catch and handle exceptions

{cerr<< "error of dividing zero.\n"; exit (1);//Exception Exit program}

}

"Run Results" create a new C + + source file in Visual C + +, enter the code above, and run it correctly after compilation.

"Sample parsing" in the preceding code, the try statement is used in the 14th to 19th line of the main function main () to define the exception, which contains 3 statements with possible exceptions, and they are functions that divide the two number of calls. In line 20th to 24th of the code, exception handling is defined, that is, the statement in the code is executed after the exception is caught. In addition, the Code 5~8 line in function fuc () implements C + + throwing exceptions through the throw statement.

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C + + tips for throwing exceptions