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 of Implicit Conversion provides an example.

Listing 1. Example of Implicit Conversion

#pragma warn_implicitconv on

float f;
signed int si;
unsigned int ui;

int main()
{
    f  = si; /* WARNING */
    si = f; /* WARNING */
    ui = si; /* WARNING */
    si = ui; /* WARNING */
}

Note: This option "opens the gate" for the checking of implicit conversions. The sub-pragmas warn_impl_f2i_conv , warn_impl_i2f_conv , and warn_impl_s2u_conv control the classes of conversions checked.

By default, this pragma is off .