CHECKF

Syntax CHECKF (float$)
Location CONTROL (DIY Toolkit Vol E)

Just like CHECK%, the function CHECKF takes the specified string and coerces it to a number. This time, however, the number returned will be a floating point rather than an integer as returned by CHECK%.

CHECKF works just like CHECK% except that a return value of -1E600 signifies unacceptable strings.

CROSS-REFERENCE

CHECK% and TTEFP are worth a look.