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The - mathematical operator performs subtraction on two numerical values or negates a single value.

Syntax: return_value = number1 - number2


  • Numbers used can be any literal or variable numerical value type.
  • Subtracting a negative value will actually perform addition with the other value.
  • Subtracting a negative or negated value will make the return value more positive.
  • Addition and subtraction are the last operations performed in Qbasic's normal order of operations.
  • Subtraction cannot be performed on STRING values.

See also:

+ positive (addition operator)

Mathematical Operations

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