VAL

Parse the leading number in a string. Stops at the first invalid character; returns 0 when the string does not start with a number.

number = VAL(string$)

string$ - leading spaces are skipped; an optional leading ‘-’ is honoured

See also STR$.

Example:

PRINT VAL("  -12.5abc")     ' -12.5

Source: docs/help/val.txt inmmcore. On the computer, typeHELP VAL.