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Diffstat (limited to 'chapter17/README.md')
| -rw-r--r-- | chapter17/README.md | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/chapter17/README.md b/chapter17/README.md index 331cdc3d..cdbca21b 100644 --- a/chapter17/README.md +++ b/chapter17/README.md @@ -25,7 +25,12 @@ Allow pre-increment for identifiers only, for now: `--pc`. ## Operator assignment Along the same lines as post-increment, we now allow `op=` assignment -with semantics similar to other languages. +on local variables with semantics similar to other languages. The supported +operators are `+=`, `-=`, `*=`, `/=`, `&=`, `|=`, `^=`, `<<=`, `>>=`, and `>>>=`. +Bitwise and shift assignments require integer operands; `>>=` preserves the sign +while `>>>=` shifts in zeros. The assignment evaluates its right-hand side once, +stores the result narrowed to the variable's type, and yields that stored value. +Assignments associate right-to-left, as in `x |= y <<= 2`. `x += y` @@ -159,4 +164,4 @@ for( int i=0; i<ary#; i++ ) if( ary[i]==e ) return i; return -1; -```
\ No newline at end of file +``` |