Unary Positive (+)
Gives its single operand a numeric interpretation.
Details
The Unary Positive operator (+) gives its single operand a numeric interpretation. If its operand has a string value, it converts it to a numeric value. It does this by sequentially parsing the characters of the string as a number, until it encounters an invalid character. It then returns whatever leading portion of the string was a well-formed numeric.
Examples
For example:
WRITE + "32 dollars and 64 cents" // 32
If the string has no leading numeric characters, the Unary Positive operator gives the operand a value of zero. For example:
WRITE + "Thirty-two dollars and 64 cents" // 0
The Unary Positive operator has no effect on numeric values. It does not alter the sign of either positive or negative numbers. For example:
SET x = -23
WRITE " x: ", x,! // -23
WRITE "+x: ",+x,! // -23
