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Chapter ‎18   Unsafe code

integer-literal: decimal-integer-literal hexadecimal-integer-literal

decimal-integer-literal: decimal-digits   integer-type-suffixopt

decimal-digits: decimal-digit decimal-digits   decimal-digit

decimal-digit:  one of 0  1  2  3  4  5  6  7  8  9

integer-type-suffix:  one of U  u  L  l  UL  Ul  uL  ul  LU  Lu  lU  lu

hexadecimal-integer-literal: 0x   hex-digits   integer-type-suffixopt 0X   hex-digits   integer-type-suffixopt

hex-digits: hex-digit hex-digits   hex-digit

hex-digit:  one of 0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  a  b  c  d  e  f

The type of an integer literal is determined as follows:

If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.

If the literal is suffixed by U or u, it has the first of these types in which its value can be represented: uint, ulong.

If the literal is suffixed by L or l, it has the first of these types in which its value can be represented: long, ulong.

If the literal is suffixed by UL, Ul, uL, ul, LU, Lu, lU, or lu, it is of type ulong.

If the value represented by an integer literal is outside the range of the ulong type, a compile-time error occurs.

As a matter of style, it is suggested that “L” be used instead of “l” when writing literals of type long, since it is easy to confuse the letter “l” with the digit “1”.

To permit the smallest possible int and long values to be written as decimal integer literals, the following two rules exist:

When a decimal-integer-literal with the value 2147483648 (231) and no integer-type-suffix appears as the token immediately following a unary minus operator token (§‎7.6.2), the result is a constant of type int with the value −2147483648 (−231). In all other situations, such a decimal-integer-literal is of type uint.

When a decimal-integer-literal with the value 9223372036854775808 (263) and no integer-type-suffix or the integer-type-suffix L or l appears as the token immediately following a unary minus operator token (§‎7.6.2), the result is a constant of type long with the value −9223372036854775808 (−263). In all other situations, such a decimal-integer-literal is of type ulong.

2.4.4.3 Real literals

Real literals are used to write values of types float, double, and decimal.

Copyright Microsoft Corporation 1999-2003. All Rights Reserved.41

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