18 lines
978 B
Markdown
18 lines
978 B
Markdown
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# Allow digit separator after 0b or 0x
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In C# 7.2, we extend the set of places that digit separators (the underscore character) can appear in integral literals. [Beginning in C# 7.0, separators are permitted between the digits of a literal](https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.0/digit-separators.md). Now, in C# 7.2, we also permit digit separators before the first significant digit of a binary or hexadecimal literal, after the prefix.
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``` c#
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123 // permitted in C# 1.0 and later
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1_2_3 // permitted in C# 7.0 and later
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0x1_2_3 // permitted in C# 7.0 and later
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0b101 // binary literals added in C# 7.0
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0b1_0_1 // permitted in C# 7.0 and later
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// in C# 7.2, _ is permitted after the `0x` or `0b`
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0x_1_2 // permitted in C# 7.2 and later
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0b_1_0_1 // permitted in C# 7.2 and later
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```
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We do not permit a decimal integer literal to have a leading underscore. A token such as `_123` is an identifier.
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