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EXAMPLE 1.8 An Erroneous Program
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This is the same program as above except that the required semicolon on the third line is missing: int main() { // THIS SOURCE CODE HAS AN ERROR: int n=44 cout << "n = " << n << endl; } One compiler issued the following error message: Error : ';' expected Testing.cpp line 4 cout << "n = " << n << endl; This compiler underlines the token where it finds the error. In this case, that is the cout token at the beginning of the fourth line. The missing token was not detected until the next token was encountered.
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1.7 INITIALIZING VARIABLES In most cases it is wise to initialize variables where they are declared. EXAMPLE 1.9 Initializing Variables
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This program contains one variable that is not initialized and one that is initialized. int main() { // prints "m = and n = 44": int m; // BAD: m is not initialized int n=44; cout << "m = " << m << " and n = " << n << endl; } m = and n = 44 The output is shown in the shaded box. This compiler handles uninitialized variables in a special way. It gives them a special value that appears as when printed. Other compilers may simply leave garbage in the variable, producing output like this: m = -2107339024 and n = 44
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In larger programs, uninitialized variables can cause troublesome errors. 1.8 OBJECTS, VARIABLES, AND CONSTANTS An object is a contiguous region of memory that has an address, a size, a type, and a value. The address of an object is the memory address of its first byte. The size of an object is simply the number of bytes that it occupies in memory. The value of an object is the constant determined by the actual bits stored in its memory location and by the object s type which prescribes how those bits are to be interpreted. For example, with GNU C++ on a UNIX workstation, the object n defined by
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has the memory address 0x3fffcd6, the size 4, the type int, and the value 22. (The memory address is a hexadecimal number. See Appendix G.)
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The type of an object is determined by the programmer. The value of an object may also be determined by the programmer at compile time, or it may be determined at run-time. The size of an object is determined by the compiler. For example, in GNU C++ an int has size 4, while in Borland C++ its size is 2. The address of an object is determined by the computer s operating system at run-time. Some objects do not have names. A variable is an object that has a name. The object defined above is a variable with name n . The word variable is used to suggest that the object s value can be changed. An object whose value cannot be changed is called a constant. Constants are declared by preceding its type specifier with the keyword const, like this:
const int N = 22;
Constants must be initialized when they are declared. EXAMPLE 1.10 The const Specifier
This program illustrates constant definitions: int main() { // defines constants; has no output: const char BEEP = '\b'; const int MAXINT = 2147483647; const int N = MAXINT/2; const float KM_PER_MI = 1.60934; const double PI = 3.14159265358979323846; }
Constants are usually defined for values like that will be used more than once in a program but not changed. It is customary to use all capital letters in constant identifiers to distinguish them from other kinds of identifiers. A good compiler will replace each constant symbol with its numeric value. 1.9 THE INPUT OPERATOR In C++, input is almost as simple as output. The input operator >> (also called the get operator or the extraction operator) works like the output operator <<. EXAMPLE 1.11 Using the Input Operator
int main() { // tests the input of integers, floats, and characters: int m, n; cout << "Enter two integers: "; cin >> m >> n; cout << "m = " << m << ", n = " << n << endl; double x, y, z; cout << "Enter three decimal numbers: "; cin >> x >> y >> z; cout << "x = " << x << ", y = " << y << ", z = " << z << endl; char c1, c2, c3, c4; cout << "Enter four characters: ";
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