Add additional integer math and conversion warnings and the intwarning function

[David Bateman]

David Bateman wrote:
> Attached is a patch that adds the warnings
>
> Octave:int-convert-nan
> Octave:int-convert-non-int-val
> Octave:int-math-overflow
>
> and the intwarning function to control them. Initially they are off by 
> default. For example consider
>
> octave:1> intwarning("query")
> The state of warning "Octave:int-convert-nan" is "off"
> The state of warning "Octave:int-convert-non-int-val" is "off"
> The state of warning "Octave:int-convert-overflow" is "off"
> The state of warning "Octave:int-math-overflow" is "off"
>
> octave:2> a = uint8(254.7)
> a = 255
> octave:3> a + 1
> ans = 255
> octave:4> intwarning("on")
> octave:5> a = uint8(254.7)
> warning: Conversion of non-integer value from scalar to uint8 matrix
> a = 255
> octave:6> a + 1
> warning: data truncated converting from uint8 scalar to scalar
> ans = 255
>
> regards
> David
>
Please use the attached version instead as it improves the error 
messages. For example

octave:1> intwarning("on")
octave:2> a = uint8(254.7)
warning: Conversion of non-integer value from scalar to uint8 matrix
a = 255
octave:3> a + 1
warning: data truncated for uint8 scalar by scalar binary operator +
ans = 255

Regards
David


-- 
David Bateman                                David.Bateman at motorola.com
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
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