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C++ allows a very convenient method of assigning many variables the same value: using multiple assignments in a single statement For example, this fragment assigns count, incr, and index the value 10:
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count = incr = index = 10;
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In professionally written programs, you will often see variables assigned a common value using this format
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Using sizeof
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Sometimes it is helpful to know the size, in bytes, of a type of data Since the sizes of C++ s built-in types can differ between computing environments, knowing the size of a variable in all situations can be difficult To solve this problem, C++ includes the sizeof compile-time operator, which has these general forms: sizeof (type) sizeof value
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sizeof is a compile-time operator that obtains the size of a type or value
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The first version returns the size of the specified data type, and the second returns the size of the specified value As you can see, if you want to know the size of a data type, such as int, you must enclose the type name in parentheses If you want to know the size of a value, no parentheses are needed, although you can use them if you want To see how sizeof works, try the following short program For many 32-bit environments, it displays the values 1, 4, 4, and 8
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// Demonstrate sizeof #include <iostream> using namespace std; int main() { char ch; int i; cout cout cout cout << << << << sizeof sizeof sizeof sizeof ch << ' '; // size of char i << ' '; // size of int (float) << ' '; // size of float (double) << ' '; // size of double
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return 0; }
As mentioned earlier, sizeof is a compile-time operator All information necessary for computing the size of a variable or data type is known during compilation You may apply sizeof to any data type For example, when it is applied to an array, it returns the number of bytes used by the array Consider this fragment:
int nums[4]; cout << sizeof nums; // displays 16
Assuming 4-byte integers, this fragment displays the value 16 (ie, 4 bytes times 4 elements) sizeof primarily helps you write code that depends upon the size of the C++ data types Remember, since the sizes of types in C++ are defined by the implementation, it is bad style to make assumptions about their sizes in code that you write
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There are two primary ways in which a C++ program can store information in the main memory of the computer The first is through the use of variables The storage provided by variables is fixed at compile time, and cannot be altered during the execution of a program The second way information can be stored is through the use of C++ s dynamic allocation system In this method, storage for data is allocated as needed from the free memory area that lies between your program (and its permanent storage area) and the stack This region is called the heap (Figure 9-2 shows conceptually how a C++ program appears in memory)
C++ from the Ground Up
A conceptual view of memory usage in a C++ program
Figure 9-2
Dynamic allocation is the means by which a program can obtain memory during its execution
Dynamically allocated storage is obtained at run time Thus, dynamic allocation makes it possible for your program to create variables during its execution, and it can create as many or as few variables as required, depending upon the situation This makes dynamic allocation especially valuable for data structures such as linked lists and binary trees, which change size as they are used Dynamic allocation for one purpose or another is an important part of nearly all real-world programs Memory to satisfy a dynamic allocation request is taken from the heap As you might guess, it is possible, under fairly extreme cases, for free memory to become exhausted Therefore, while dynamic allocation offers greater flexibility, it, too, is finite
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