Cfloat Function

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Function:

Verifies whether the value of a floating-point variable is valid. Returns 0- VALID if the floating point value is OK, and 1- INVALID if the floating-point value is invalid.

Syntax:

cfloat(byref num as real) as valid_invalid

See Also:

strtof, ftostr

 


Part

Description

num

Variable to check.

Details

Floating-point calculations can lead to invalid result (#INF, -#INF errors, as per IEEE specification). When your application is in the debug mode you will get a FPERR exception if such an error is encountered. In the release mode the Virtual Machine won't generate an exception, yet your application may need to know if a certain floating-point variable contains correct value. This is where cfloat function comes handy.

Examples

 

dim r1 as real

dim v as invalid_valid

 

dim r1=10E30

v=cfloat(r1) 'v will return 0- VALID

r1=r1*10E20 'at this point you will get FPERR exception if you are in the debug mode

v=cfloat(r1) 'v will return 1- INVALID