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Arithmetic Exception

rascal-0.41.2

Synopsis​

An arithmetic exception occurred.

Types​

data RuntimeException = ArithmeticException(str message);

Usage​

import Exception; (only needed when ArithmeticException is used in catch)

Description​

This error is generated when an illegal arithmetic operation occurs or when a numeric function is called with an out-of-range argument.

Remedies:

  • Check the validity of the argument before you call the function or apply the operator.
  • Catch the ArithmeticException yourself, see try catch statement.

Examples​

Division by 0 gives an error:

rascal>3/0;
|prompt:///|(2,1,<1,2>,<1,3>): ArithmeticException("/ by zero")

Giving an out-of-range argument to a mathematical function also gives an error:

rascal>import util::Math;
ok
rascal>tan(-550000000000000000000000);
|std:///util/Math.rsc|(10411,246,<478,0>,<490,28>): ArithmeticException("x should be between -(pi/2) and (pi/2)")
    at *** somewhere ***(|std:///util/Math.rsc|(10411,246,<478,0>,<490,28>))
    at tan(|prompt:///|(5,24,<1,5>,<1,29>))

We can also catch the ArithmeticException error. First import the Rascal exceptions (which are also included in Prelude) and IO:

rascal>import Exception;
ok
rascal>import IO;
ok
rascal>try 
|1 >>>>  println(3/0); 
|2 >>>>catch ArithmeticException(str msg): 
|3 >>>>  println("The message is: <msg>");
The message is: / by zero
ok