AN3350 datasheet(96/185 Pages) STMICROELECTRONICS

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C compiler

AN3350

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Doc ID 018512 Rev 2

0x1.8p0L

The standard library supports printing values of type float in this format using the “%a” and

“%A” specifiers.

12.2.14

Variable-length arrays

Variable length arrays are supported within local or function prototype scope, as required by

the ISO/IEC 9899-1999 (“C99”) standard. Example 33 shows an example.

Example 33 Example of C99 variable length array usage

#pragma c99 on

void f(int n) {

int arr[n];

/* ... */

}

While the example shown in Example 34 generates an error message.

Example 34 Bad example of C99 variable length array usage

#pragma c99 on

int n;

int arr[n];

// ERROR: variable length array

// types can only be used in local or

// function prototype scope.

A variable length array cannot be used in a function template’s prototype scope or in a local

template typedef, as shown in Example 35.

Example 35 Bad example of C99 usage in function prototype

#pragma c99 on

template<typename T> int f(int n, int A[n][n]);

{

};

// ERROR: variable length arrays

// cannot be used in function template prototypes

// or local template variables

12.2.15

Unsuffixed decimal literal values

Example 36 shows an example of specifying decimal literal values without a suffix to specify

the literal’s type.

Example 36 Examples of C99 unsuffixed constants

#pragma c99 on

// Note: ULONG_MAX == 4294967295

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