AN3350 datasheet(149/185 Pages) STMICROELECTRONICS

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AN3350

Pragmas for diagnostic messages

Doc ID 018512 Rev 2

149/185

19.22

warn_impl_s2u_conv

Controls the issuing of warning messages for implicit conversions between the signed

int

and unsigned int data types.

Syntax

#pragma warn_impl_s2u_conv on | off | reset

Remarks

If you enable this pragma, the compiler issues a warning message for implicitly converting

either from signed int to unsigned int or vice versa.Example 96 provides an

example.

Example 96 Example of implicit conversions between signed int and unsigned int

#pragma warn_impl_s2u_conv on

signed int si;

unsigned int ui;

int main()

{

ui = si; /* WARNING */

si = ui; /* WARNING */

#pragma warn_impl_s2u_conv off

ui = si; /* OK */

si = ui; /* OK */

}

By default, this pragma is enabled.

19.23

warn_implicitconv

Controls the issuing of warning messages for all implicit arithmetic conversions.

Syntax

#pragma warn_implicitconv on | off | reset

Remarks

If you enable this pragma, the compiler issues a warning message for all implicit arithmetic

conversions when the destination type might not represent the source value.Example 97

provides an example.

Example 97 Example of implicit conversion

#pragma warn_implicitconv on

float f;

signed int si;

unsigned int ui;

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