unary-operators.md

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• Unary operators ++ --

Unary operators

BIPLAN supports only prefix increment and decrement unary operators. Prefix unary operators are used to increment or decrement its operand. The increment operator ++ adds 1, the decrement operator -- subtracts 1. Both ++ and -- can be used as prefix operators (before the operand: ++v). For example ++v increments the value of v before it is used.

Prefix unary operators in statement must be used only when incrementing or decrementing variables:

@a = 0
print ++@a // Prints "1" and sets a = 1 in memory

BIPLAN unary operators can be chained:

@a = 0
print ++++@a // Sets a = 2 in memory and prints "2"

@a = 1
print ----@a // Sets a = -1 in memory and prints "-1"