Exercise 85 in Java

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Exercise 85
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Explain why the following new expressions are errors
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(a) (b) (c) (d)
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const float *pf = new const float[100]; double *pd = new double[10][getDim()]; int (*pia2)[ 1024 ] = new int[ ][ 1024 ]; const int *pci = new const int;
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Exercise 86
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Given the following new expression, how would you delete pa
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typedef int arr[10]; int *pa = new arr;
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Exercise 87
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Which ones of the following delete expressions, if any, are potential run-time errors Why
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int globalObj; char buf[1000]; void f() { int *pi = &globalObj; double *pd = 0; float *pf = new float(0); int *pa = new(buf)int[20]; delete pi; // (a) delete pd; // (b) delete pf; // (c) delete[] pa; // (d) }
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Exercise 88
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Which of the following auto_ptr declarations are illegal or likely to result in subsequent program error Explain what the problem is with each one
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int int int (a) (c) (e) (g)
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ix = 1024; *pi = & ix; *pi2 = new int( 2048 ); auto_ptr<int> p0(ix); auto_ptr<int> p2(pi2); auto_ptr<int> p4(new int(2048)); auto_ptr<int> p6(p2release());
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(b) (d) (f) (h)
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auto_ptr<int> auto_ptr<int> auto_ptr<int> auto_ptr<int>
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p1(pi); p3(&ix); p5(p2get()); p7(p2);
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Exercise 89
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Explain the difference between these two statements:
int *pi0 = p2get(); int *pi1 = p2release();
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Under what conditions would each respective invocation be more appropriate
Exercise 810
Suppose we have the following:
auto_ptr< string > ps( new string( "Daniel" ) );
What is the difference, if any, between the following two invocations of assign() Which do you think is preferable Why
psget()->assign( "Danny" ); ps->assign( "Danny" );
Namespace Definitions
By default, each object, function, type, or template declared in global scope, also called global namespace scope, introduces a global entity Every global entity introduced in the global namespace scope must have a unique name A function and an object, for example, cannot have the same name, whether or not they are declared in the same program text file This means that to use a library with our programs, we must ensure that the names of the global entities in our programs do not collide with the names of the global entities from the library This can be quite difficult to enforce if the program is made of libraries provided by many vendors and the various libraries introduce many names in the global namespace scope How can we be sure when combining libraries from these different vendors that the names of the global entities in our programs won't clash with the names of the global entities declared in the libraries This name clashing problem is called the global namespace pollution problem Programmers have been able to avoid these problems by making the names of their global entities very long, often prefixing the names in their program with specific character sequences For example:
class cplusplus_primer_matrix { }; void inverse( cplusplus_primer_matrix & );
However, this solution is not ideal A program written in C++ may have a potentially large number of global classes, functions, and templates visible to the entire program It can be cumbersome for programmers to write programs that use such long names Namespaces allow us to better manage the global name space pollution problem The author of a library can define a namespace to hide the names in the library from the global namespace For example:
namespace cplusplus_primer { class matrix { /* */ }; void inverse ( matrix & ); }
The namespace cplusplus_primer is a user-declared namespace (in comparison to the global namespace, which is implicitly declared
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and exists in every program) Each user-declared namespace represents a distinct namespace scope A user-declared namespace scope can contain other nested namespace definitions as well as declarations or definitions for functions, objects, templates, and types The entities declared within a namespace are called namespace members Just as is the case for the global namespace scope, each name in a user-declared namespace must refer to a unique entity within that namespace However, because different user-declared namespaces introduce different scopes, different user-declared namespaces may have members with the same name The name of a namespace member is automatically compounded or qualified by the name of its namespace For example, the name of the matrix class declared in namespace cplusplus_primer is cplusplus_primer::matrix, and the name of the function is cplusplus_primer::inverse() The members of the namespace cplusplus_primer can be used in a program using their qualified names, as follows:
void func( cplusplus_primer::matrix &m ) { // cplusplus_primer::inverse(m); return m; }
If another user-declared namespace (say, DisneyFeatureAnimation) also provides a matrix class and we want to use this class instead of the one defined in the namespace cplusplus_primer, then we need to modify func() as follows:
void func( DisneyFeatureAnimation::matrix &m ) { // DisneyFeatureAnimation::inverse(m); return m; }