feature sum: REAL make is 45 in Microsoft Office Assign Code 3 of 9 in Microsoft Office feature sum: REAL make is 45 EAN-13 for visual

feature sum: REAL make is 45 use none none creator toproduce none in create ean 13 R. S. Rist, 1993.

.NET CF local this: REAL do .. .

this := io.lastreal add (this) end -- make add (new: REAL) is -- add the new number to the sum do sum := sum + new end -- add. Data is passed from th none for none e caller to the called routine through an argument list. The calling code supplies a set of values to be passed; call these the actual arguments. The routine header has a matching list to receive these values; call these the formal arguments.

The formal argument list in the routine header consists of one or more variable declarations; declarations of different types are separated by semi-colons. Some examples of routine calls and the routine headers with arguments are deposit (43.60)-- actual argument is the value 43.

60 deposit (number: REAL) is -- one formal argument of type REAL gcd (45, 35) -- actual arguments are the values 43 and 35 gcd (this, that: REAL) is -- two formal arguments of type REAL do_something (42, 64, 83.7, 0.0001, y ) -- actual arguments are the five values .

.. do_something (a, b: INTEGER; c, d: REAL; e: CHARACTER) is -- five formal arguments of types .

.. When the routine is called, each formal argument is bound to the corresponding actual argument.

Argument binding is simple: each formal argument is created as a local variable and given the value of the actual argument, when the routine is called. The first formal argument is bound to the first actual argument, the second formal argument is bound to the second actual argument, and so on until all the arguments are bound. Binding is done purely on the order in which the arguments occur.

The name is irrelevant; only the shape, defined by the argument list, matters when the actual and formal arguments are bound. The actual and formal arguments must therefore agree in number, order and type or the two argument lists cannot be bound. Once a formal argument has been bound, you are not allowed to change its value; if you try, the system will not compile.

The calling code supplies values to the routine, to be used in the routine. The type of the value that is passed is defined in the routine header by the formal argument, and this is the only constraint on the argument. The calling code can supply a literal, a constant, a variable, an expression, or a function as its value; all the called code cares about is that the supplied value be of the defined type.

A routine header and several legal routine calls are shown below: add (number: REAL) is add (3) REAL add (3.6) -- literal of type REAL add (Pi) -- constant of type REAL add (this) -- variable of type REAL add (this + 32 - 4 * that) -- expression that evaluates to a REAL value add (sqrt (this)) value -- function that returns a REAL -- INTEGER literal, converted to heavier. R. S. Rist, 1993.

Common error: a formal none for none argument has the same name as a feature in the class, a name clash Error code: VRFA Error: Formal argument has same name as feature of the class What to do: Change the name of the argument, or that of the feature Common error: a formal argument has the same name as a local in the feature, a name clash Error code: VRLE (2) Error: local entity has samen name as formal argument of the same routine What to do: Change name of local entity, or of argument Common error: the number of actual and formal arguments do not match Error code: VUAR (1) Error: wrong number of actual arguments in feature call What to do: make sure that number of actuals matched number of formals Common error: the type of the actual and formal arguments does not match Error code: VUAR (2) Type error: non-conforming actual argument in feature call What to do: make sure that type of actual argument conforms to type of corresponding formal argument. Explanation: conform means roughly of the same type ; for the moment, assume that it means same or heavier type . Two variables of the same type conform, INTEGER conforms to REAL, and REAL conforms to DOUBLE, so INTEGER conforms to DOUBLE.

A more precise definition is given in Section 11.2..

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