Addition Assignment (+=)

The += operator used after the LET keyword, assigns a variable by adding the current variable value to a numeric expression.

Syntax

variable += expr

Important: This operator cannot be used as an element of an expression, it is only allowed as assignment operator with the LET instruction.

The += assignment operator adds the right-hand numeric expression to the value of the left-hand variable and assigns the result to the variable.

In the next example, the += operator is used to increment an integer variable by 100:

MAIN
  DEFINE x INTEGER
  LET x = 500
  LET x += 100
END MAIN