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program TestSignAlgorithm;
uses
sysutils;
const
a1 = 2;
a2 = 1;
a3 = 0;
a4 = -1;
a5 = -2;
var
index, number: longint;
begin
writeln;
writeln ('This tests the arithmetic procedure used in libavutil and libavcodec.');
writeln ('positive numbers should give 1, negative numbers -1.');
writeln ('-17: ', not((-17 shr 30) and $00000002) + 2);
writeln ('-16: ', not((-16 shr 30) and $00000002) + 2);
writeln ('-15: ', not((-15 shr 30) and $00000002) + 2);
writeln (' -3: ', not(( -3 shr 30) and $00000002) + 2);
writeln (' -2: ', not(( -2 shr 30) and $00000002) + 2);
writeln (' -1: ', not(( -1 shr 30) and $00000002) + 2);
writeln (' 0: ', not(( 0 shr 30) and $00000002) + 2);
writeln (' 1: ', not(( 1 shr 30) and $00000002) + 2);
writeln (' 2: ', not(( 2 shr 30) and $00000002) + 2);
writeln (' 3: ', not(( 3 shr 30) and $00000002) + 2);
writeln (' 8: ', not(( 8 shr 30) and $00000002) + 2);
writeln ('MaxInt: ', MaxInt:12, ' ', IntToHex(MaxInt,8), ' ', not((MaxInt shr 30) and $00000002) + 2);
writeln ('MaxLongint: ', MaxLongint:12, ' ', IntToHex(MaxLongint,8), ' ', not((MaxLongint shr 30) and $00000002) + 2);
writeln ('MinInt: ', -MaxInt - 1:12, ' ', IntToHex(-MaxInt - 1,8), ' ', not(((-MaxInt - 1) shr 30) and $00000002) + 2);
writeln ('MinLongInt: ', -MaxLongint - 1:12, ' ', IntToHex(-MaxLongint - 1,8), ' ', not(((-MaxLongint - 1) shr 30) and $00000002) + 2);
writeln (a1, ' ', IntToHex(a1,8) , ' ', not((a1 shr 30) and $00000002) + 2);
writeln (a2, ' ', IntToHex(a2,8) , ' ', not((a2 shr 30) and $00000002) + 2);
writeln (a3, ' ', IntToHex(a3,8) , ' ', not((a3 shr 30) and $00000002) + 2);
writeln (a4, ' ', IntToHex(a4,8) , ' ', not((a4 shr 30) and $00000002) + 2);
writeln (a5, ' ', IntToHex(a5,8) , ' ', not((a5 shr 30) and $00000002) + 2);
writeln;
writeln ('Hit RETURN for more positive numbers. The last one overflows and becomes negative.');
readln;
number := 1;
for index := 1 to 32 do
begin
writeln (index:2, ': ', number:11, ' ', IntToHex(number shr 30 ,8):10, ' ', not((number shr 30) and $00000002) + 2);
number := number * 2;
end;
writeln;
writeln ('Hit RETURN for more positive numbers.');
readln;
number := -1;
for index := 1 to 32 do
begin
writeln (index:2, ': ', number:11, ' ', IntToHex(number shr 30 ,8):10, ' ', not((number shr 30) and $00000002) + 2);
number := number * 2;
end;
end.
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