16simpTypes_3014

16simpTypes_3014 - Lecture File 16 COP 3014 January 16,...

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Lecture File 16 COP 3014 January 16, 2008 A. Ford Tyson 1 ± Simple Data Types integra COP 3014 Lecture File 16 1 –integral –floating point –enumeration Copyright 1997-present, Ann Ford Tyson Data Types ± Data Type – a set of possible values (e.g. the set of integers) plus a set of legal operations on those values (e.g. addition, subtraction, 2 etc.) ± Simple Data Type – set of distinct "atomic" values (no component parts) and operations – e.g. 'A' 17 -3.14 Simple Data Types in C++ integral floating 3 int char short long [ unsigned ] bool enum float double long double
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Lecture File 16 COP 3014 January 16, 2008 A. Ford Tyson 2 integral types ± have discrete values which are ordered -5 < 17 'A' < 'C' false < true 4 ± each value has a unique successor and predecessor in the data type (unless it is at the end of the range) what comes after 5? 6 (no question!) floating point types ± have values which are ordered but are not discrete ± a value does not have a unique successor or a predecessor in the data 5 type what comes after 5.0? depends on precision of machine 5.00001 5.000001 5.0000001 ??? using integer vs float: loops and switch ± we use integral types only for loop control variables and for switch control ± for (x = 5 0; x < 6 0; x++) NOT used 6 for (x 5.0; x < 6.0; x++) NOT used ± for (i = 5; i < 6; i++) IS used ± switch (<case selector>) { case <label1> : . .. integral only !
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Lecture File 16 COP 3014 January 16, 2008 A. Ford Tyson 3 More about integral types ± type ranges are in climits ± range is determined by precision ± in INT MIN thru INT MAX 7 int INT_MIN thru INT_MAX short int SHRT_MIN thru SHRT_MAX long int LONG_MIN thru LONG_MAX and 0 thru UINT_MAX, USHRT_MAX, or ULONG_MAX char CHAR_MIN thru CHAR_MAX unsigned char 0 thru UCHAR_MAX More about integral types p.2 ± ANSI standard guarantees that 1 <= sizeof (char) <= sizeof (short) <= sizeof (int) <= sizeof (long) 8 ± on our platform: 1 2 4 4 (bytes) ± examples: literal integral constants 5 defaults to int 5L forces it to a long int 05 makes it octal (base 8) More about floating types ± type ranges and max number of digits in mantissa are in cfloat ± range is determined by precision 9 ± float FLT_MIN thru FLT_MAX double DBL_MIN thru DLB_MAX long double LDBL_MIN thru LDBL_MAX
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Lecture File 16 COP 3014 January 16, 2008 A. Ford Tyson 4 More about floating types p.2 ± ANSI standard guarantees that sizeof (float) <= sizeof (double) <= sizeof (long double) note: double comes from double precision 10 ± on our platform: 4 8 8 (bytes) FLT_DIG is 6, DBL_DIG is 15 ± examples: literal floating constants 5.0
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This note was uploaded on 03/14/2011 for the course COP 3014 taught by Professor Tyson during the Fall '10 term at FSU.

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16simpTypes_3014 - Lecture File 16 COP 3014 January 16,...

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