cs31 lecture 17

42 nt 4 basic types in c x how to determine the data

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Unformatted text preview: , can assign a value at declaration x Examples: int foo; iint bar = 42; nt 4 Basic types in C++ x How to determine the data type for a variable? x Simple: look for the basic type in C++, and find a match x Basic types: iint: a number which is an integer nt: • ex: 12345, 0, -42 float: an arbitrary number (integer or floating point)
 • ex: -1.33, -42.0, 42.0, 0.0 ex: char: a single character • ex: ‘a’, ‘b’ ex: 5 iint: examples nt: int x = 42; // ok int int x = 0; // ok int x = 421234234535; // error (out of range)
 int x = -1; // ok unsigned x = -1; // error (-1 is signed)
 unsigned int x = -42; // ok int int x = 42.12; // not ok (not integer)
 6 Be careful! x What are semantics errors may not be reported as errors What by the compiler! by x Reason: the C++ standard defines what to do for those Reason: cases cases Example: unsigned int x = -1 is defined, will hold maxint! x Be extra cautious: it is the duty of the programmer to Be determine the range of variables x B...
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This note was uploaded on 04/03/2014 for the course CS 31 taught by Professor Melkanoff during the Fall '00 term at UCLA.

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