x--; // decrementa x em um e retorna o valor antigo de x
--x; // decrementa x em um e retorna o novo valor de x
Parâmetros
x: variável. Tipos de dados permitidos: integer, long (possibly unsigned)
Retorna
O valor original ou decrementado da variável, que depende se o operador está à esquerda ou direita da variável.
Código de Exemplo
x = 2;
y = --x; // x agora contém 1, y contém 1
y = x--; // x contém 0, mas y ainda contém 1
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