By John Barnes
Ada is the language of selection for almost all of programmers focused on writing safety-critical and high-integrity software program. prior versions of John Barnes' books verified themselves because the definitive references for past types of Ada. With the discharge of the newest ISO common, Ada 2012, this new booklet becomes acknowledged because the go-to source for these wishing to profit the language or to software in it.
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6 Errors and exceptions consequently always opens the gates and starts the train irrespective of the state of the signal! Another possibility is that one of the = signs might be omitted in C. The equality then becomes an assignment and also returns the result as the argument for the test. The program still compiles, the signal is set clear, the condition is true (since clear is not 0) and so the gates are always opened and the train started on its perilous journey. The corresponding error in Ada might be to write := instead of = and of course the program will then not compile.
In these cases the program is said to be illegal and will not be executed. xxx on Thu Jan 01 01:00:00 BST 1970. 005 Cambridge Books Online © Cambridge University Press, 2014 23 24 Simple concepts • • • Other errors are detected when the program is executed. An attempt to find the square root of a negative number or divide by zero are examples of such errors. In these cases an exception is raised as we have just seen. There are also certain situations where the program breaks the language rules but there is no simple way in which this violation can be detected.
Finally, there are situations where, for implementation reasons, the language does not prescribe the order in which things are to be done. For example, the order in which the parameters of a procedure call are evaluated is not specified. If the behaviour of a program does depend on such an order then it is not considered to be incorrect but just not portable. We mentioned earlier that an overall theme in the design of Ada was concern for correctness and that errors should be detected early in the programming process.