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Top Forums Shell Programming and Scripting Complex problem about nested for loops Post 302141324 by porter on Thursday 18th of October 2007 04:19:19 PM
Old 10-18-2007
Quote:
Originally Posted by Silverlining
I don't understand what you mean...could you explain more please?
Say you have some code that adds to numbers, psuedo code below:

Code:
print a + b

and ask for somebody to test it, do they have to test every combination of numbers from minus infinity to plus infinity in order to confirm your program works?

No, you specifiy the resolution of your numbers representation and the maximum and minimum. Then the tester only needs to test a much smaller subset at either end of the range (the boundary conditions) and in the middle (the likely conditions).
 

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isinf(3M)																 isinf(3M)

NAME
isinf() - floating-point test for infinity SYNOPSIS
DESCRIPTION
The macro determines whether its argument is an infinity. The argument must be of floating type, and classification is based on the type of the argument. For HP Integrity servers, the argument can be any floating type. For PA-RISC, the argument must be either or The macro replaces the and functions, which are obsolete and are no longer supported. USAGE
To use the macro, compile either with the default option or with the and options. Make sure your program includes Link in the math library by specifying on the compiler or linker command line. RETURN VALUE
The macro returns a nonzero value if x is Otherwise, it returns zero. The macro raises no floating-point exceptions. ERRORS
No errors are defined. EXAMPLES
Take certain actions if is infinity: SEE ALSO
fpclassify(3M), isfinite(3M), isnan(3M), isnormal(3M), signbit(3M), math(5). STANDARDS CONFORMANCE
isinf(3M)
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