Datasheet

Standard C Implementation Definition

B.1.12 Statements

The number of case values in a

switch

statement is limited only by memory.

Expression evaluation

The compiler performs the usual arithmetic conversions (promotions) set out in the

appropriate C or C++ standard before evaluating an expression.

Note

• The compiler can re-order expressions involving only associative and

commutative operators of equal precedence, even in the presence of parentheses.

For example, a + (b – c) might be evaluated as (a + b) – c if a, b, and c are integer

expressions.

• Between sequence points, the compiler can evaluate expressions in any order,

regardless of parentheses. Therefore, side effects of expressions between

sequence points can occur in any order.

• The compiler can evaluate function arguments in any order.

Any aspect of evaluation order not prescribed by the relevant standard, can vary

between releases of the ARM compilers.

B.1.13 Preprocessing directives

The ANSI standard C header files are stored within the compiler and can be referred to

as described in the standard, for example,

#include <stdio.h>

Quoted names for includable source files are supported. The compiler will accept host

filenames or UNIX filenames. For UNIX filenames on non-UNIX hosts, the compiler

tries to translate the filename to a local equivalent.

The recognized

#pragma

directives are shown in Pragmas on page 3-2.