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Compile-time calculation: Difference between revisions
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=={{header|Visual Basic .NET}}==
The Roslyn compiler performs constant folding at compile-time and emits IL that contains the result.
<lang vbnet>Module Program
Const FACTORIAL_10 = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1
Sub Main()
Console.WriteLine(FACTORIAL_10)
End Sub
End Module</lang>
{{out|Emitted IL|note=disassembled with ILSpy}}
'''Compiler:''' Roslyn Visual Basic, language version 15.8
<!--CIL assembly has a similar overall syntax to C#, so colorize it as such.-->
<lang Csharp>.class private auto ansi sealed Program
extends [System.Runtime]System.Object
{
.custom instance void Microsoft.VisualBasic.CompilerServices.StandardModuleAttribute::.ctor() = (
01 00 00 00
)
// Fields
.field private static literal int32 FACTORIAL_10 = int32(3628800)
// Methods
.method public static
void Main () cil managed
{
.custom instance void [System.Runtime]System.STAThreadAttribute::.ctor() = (
01 00 00 00
)
// Method begins at RVA 0x2060
// Code size 11 (0xb)
.maxstack 8
.entrypoint
IL_0000: ldc.i4 3628800
IL_0005: call void [System.Console]System.Console::WriteLine(int32)
IL_000a: ret
} // end of method Program::Main
} // end of class Program</lang>
Constant expressions that appear outside of constant declarations are also folded, so
<lang vbnet>Module Program
Sub Main()
Console.WriteLine(10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1)
End Sub
End Module</lang>
and
<lang vbnet>Module Program
Sub Main()
Dim factorial As Integer
factorial = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1
Console.WriteLine(factorial)
End Sub
End Module</lang>
produce the same IL, albeit without the constant field that other assemblies can reference.
{{out|Emitted IL|note=disassembled with ILSpy}}
<lang Csharp>.class private auto ansi sealed Program
extends [System.Runtime]System.Object
{
.custom instance void Microsoft.VisualBasic.CompilerServices.StandardModuleAttribute::.ctor() = (
01 00 00 00
)
// Methods
.method public static
void Main () cil managed
{
.custom instance void [System.Runtime]System.STAThreadAttribute::.ctor() = (
01 00 00 00
)
// Method begins at RVA 0x2060
// Code size 11 (0xb)
.maxstack 8
.entrypoint
IL_0000: ldc.i4 3628800
IL_0005: call void [System.Console]System.Console::WriteLine(int32)
IL_000a: ret
} // end of method Program::Main
} // end of class Program</lang>
{{out}}
<pre>3628800</pre>
=={{header|XLISP}}==
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