| C Tutorial | Bitwise operators | |||
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Introduction to C language Integer types Char constants Int constants Type combination and promotion Int overflow Floating point types Comments Variables Assignment operator Truncation Int vs float arithmatic Mathematical operators Unary Increment Operators Pre and Post Variations C Programming Cleverness and Ego Issues Relational Operators Logical Operators Bitwise Operators Other Assignment Operators
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C includes operators to manipulate memory at the bit level. This is useful for writing low- level hardware or operating system code where the ordinary abstractions of numbers, characters, pointers, etc... are insufficient -- an increasingly rare need. Bit manipulation code tends to be less "portable". Code is "portable" if with no programmer intervention it compiles and runs correctly on different types of computers. The bitwise operations are typically used with unsigned types. In particular, the shift operations are guaranteed to shift 0 bits into the newly vacated positions when used on unsigned values.
~ Bitwise Negation (unary) – flip 0 to 1 and 1 to 0 throughout
& Bitwise And
| Bitwise Or
^ Bitwise Exclusive Or
>> Right Shift by right hand side (RHS) (divide by power of 2)
<< Left Shift by RHS (multiply by power of 2)
Do not confuse the Bitwise operators with the logical operators. The bitwise connectives are one character wide (&, |) while the boolean connectives are two characters wide (&&, ||). The bitwise operators have higher precedence than the boolean operators. The compiler will never help you out with a type error if you use & when you meant &&. As far as the type checker is concerned, they are identical-- they both take and produce integers since there is no distinct boolean type. Want more information and Video ???
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