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The + plus mathematical operator performs addition on two numerical values or concatenate STRING values.

Syntax: return_value = number1 + number2


  • A + sign also can indicate a positive numerical value, but it is not required.
  • Numbers used can be any literal or variable numerical value type.
  • Adding one negative value will actually perform subtraction on the other value.
  • Adding two negative values will make the return value more negative.
  • Addition and subtraction are the last operations performed in Qbasic's normal order of operations.
  • The plus(+) operator can also be used to add (concatenate) literal or variable STRING values.
  • PRINT can also use + operations on string values ONLY! Numerical values will need to be converted to strings first or be included using semicolons or commas instead.

See also:

- minus (subtraction or negation operator)

Mathematical Operations

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