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A default argument should not be given a second time
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SAMPLE DIALOGUE\
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Volume of a box with Length = 4, Width = 6 and Height = 2 is 48 Volume of a box with Length = 4, Width = 6 and Height = 1 is 24 Volume of a box with Length = 4, Width = 1 and Height = 1 is 4
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If you have more than one default argument, then when the function is invoked, you must omit arguments starting from the right For example, note that in Display 48 there are two default arguments When only one argument is omitted, it is assumed to be the last argument There is no way to omit the second argument in an invocation of volume without also omitting the third argument
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Default arguments are of limited value, but sometimes they can be used to re ect your way of thinking about arguments Default arguments can only be used with callby-value parameters They do not make sense for call-by-reference parameters Anything you can do with default arguments can be done using overloading, although the default argument version will probably be shorter than the overloading version
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10 This question has to do with the programming example entitled Revised Pizza-Buying Program Suppose the evil pizza parlor that is always trying to fool customers introduces a square pizza Can you overload the function unitPrice so that it can compute the price per square inch of a square pizza as well as the price per square inch of a round pizza Why or why not
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I beheld the wretch the miserable monster whom I had created
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This section reviews some general guidelines for testing programs and functions
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s THE assert MACRO
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An assertion is a statement that is either true or false Assertions are used to document and check the correctness of programs Preconditions and postconditions, which we discussed in 3, are examples of assertions When expressed precisely and in the syntax of C++, an assertion is simply a Boolean expression If you convert an assertion to a Boolean expression, then the prede ned macro assert can be used to check whether or not your code satis es the assertion (A macro is very similar to an inline function and is used just like a function is used) The assert macro is used like a void function that takes one call-by-value parameter of type bool Since an assertion is just a Boolean expression, this means that the argument to assert is an assertion When the assert macro is invoked, its assertion argument is evaluated If it evaluates to true, then nothing happens If the argument evaluates to false, then the program ends and an error message is issued Thus, calls to the assert macro are a compact way to include error checks within your program For example, the following function declaration is taken from Programming Project 3:
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void computeCoin(int coinValue, int& number, int& amountLeft); //Precondition: 0 < coinValue < 100; 0 <= amountLeft < 100 //Postcondition: number has been set equal to the maximum number
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//of coins of denomination coinValue cents that can be obtained //from amountLeft cents amountLeft has been decreased by the //value of the coins, that is, decreased by number*coinValue
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You can check that the precondition holds for a function invocation, as shown by the following example:
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assert((0 < currentCoin) && (currentCoin < 100) && (0 <= currentAmountLeft) && (currentAmountLeft < 100)); computeCoin(currentCoin, number, currentAmountLeft);
If the precondition is not satis ed, your program will end and an error message will be output The assert macro is de ned in the library cassert, so any program that uses the assert macro must contain the following:
#include <cassert>
turning off
assert
#define NDEBUG
One advantage of using assert is that you can turn assert invocations off You can use assert invocations in your program to debug your program, and then turn them off so that users do not get error messages that they might not understand Doing so reduces the overhead performed by your program To turn off all the #define NDEBUG assertions in your program, add #define NDEBUG before the include directive, as follows: