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This is just a convenient way to define integer constants.
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2.4 CHARACTER TYPES A character type is an integral type whose variables represent characters like the letter 'A' or the digit '8'. Character literals are delimited by the apostrophe ('). Like all integral type values, character values are stored as integers. EXAMPLE 2.2 Character Variables
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int main() { // prints the character and its internally stored char c='A'; cout << "c = " << c << ", int(c) = " << int(c) << c='t'; cout << "c = " << c << ", int(c) = " << int(c) << c='\t'; // the tab character cout << "c = " << c << ", int(c) = " << int(c) << c='!'; cout << "c = " << c << ", int(c) = " << int(c) << } c = A, int(c) = 65 c = t, int(c) = 116 c = , int(c) = 9 c = !, int(c) = 33
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integer value: endl; endl; endl; endl;
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Since character values are used for input and output, they appear in their character form instead of their integral form: the character 'A' is printed as the letter A , not as the integer 65 which is its internal representation. The type cast operator int() is used here to reveal the corresponding integral value. These are the characters ASCII codes. (See Appendix A.)
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2.5 INTEGER TYPES There are 6 integer types in Standard C++: These types actually have several names. For example, short is also named short int, and int is also named signed int. You can determine the numerical ranges of the integer types on your system by running the program in the following example. EXAMPLE 2.3 Integer Type Ranges
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Fundamental Types Integral Types Integer Types short int long unsigned short unsigned int unsigned long
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This program prints the numeric ranges of the 6 integer types in C++: #include <iostream> #include <climits> // defines the constants SHRT_MIN, etc. using namespace std; int main() { // prints some of the constants stored in the <climits> header: cout << "minimum short = " << SHRT_MIN << endl; cout << "maximum short = " << SHRT_MAX << endl;
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cout cout cout cout cout cout cout cout cout cout } minimum maximum maximum maximum minimum maximum minimum maximum minimum maximum minimum maximum
<< << << << << << << << << <<
"maximum "maximum "minimum "maximum "minimum "maximum "minimum "maximum "minimum "maximum
unsigned short = 0" << endl; unsigned short = " << USHRT_MAX << endl; int = " << INT_MIN << endl; int = " << INT_MAX << endl; unsigned int = 0" << endl; unsigned int = " << UINT_MAX << endl; long= " << LONG_MIN << endl; long= " << LONG_MAX << endl; unsigned long = 0" << endl; unsigned long = " << ULONG_MAX << endl;
short = -32768 short = 32767 unsigned short = 0 unsigned short = 65535 int = -2147483648 int = 2147483647 unsigned int= 0 unsigned int= 4294967295 long = -2147483648 long = 2147483647 unsigned long = 0 unsigned long = 4294967295
The header file <climits> defines the constants SHRT_MIN, SHRT_MAX, USHRT_MIN, etc. These are the limits on the range of values that a variable of the indicated type can have. For example, the output shows that variables of type int can have values in the range 2,147,483,648 to 2,147,483,647 on this computer. On this computer, the three signed integer types have the same range as their corresponding unqualified integer type. For example, signed short int is the same as short int . This tells us that the signed integer types are redundant on this computer. The output also reveals that the range of the int type ( 2,147,483,648 to 2,147,483,647) is the same as that of the long int type, and that the range of the unsigned int type (0 to 4,294,967,295) is the same as that of the unsigned long int type. This tells us that the long integer types are redundant on this computer.
The output from Example 2.3 shows that on this computer (a Pentium II PC running the Windows 98 operating system and the CodeWarrior 3.2 C++ compiler), the six integer types have the following ranges: short: 32,768 to 32,767; (28 values 1 byte) int: 2,147,483,648 to 2,147,483,647; (232 values 4 bytes) long: 2,147,483,648 to 2,147,483,647; (232 values 4 bytes) unsigned short: 0 to 65,535; (28 values 1 byte) unsigned int: 0 to 4,294,967,295; (232 values 4 bytes) unsigned long: 0 to 4,294,967,295; (232 values 4 bytes) Note that long is the same as int and unsigned long is the same as unsigned int. The unsigned integer types are used for bit strings. A bit string is a string of 0s and 1s as is stored in the computer s random access memory (RAM) or on disk. Of course, everything stored in a computer, in RAM or on disk, is stored as 0s and 1s. But all other types of data are formatted; i.e., interpreted as something such as a signed integer or a string of characters.
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