Unsigned keyword in C

Question

Does the unsigned keyword default to a specific data type in C     I am trying to write a function for a class for the prototype   unsigned Rotate unsigned object  int count    But I don t really get what unsigned means  Shouldn t it be like unsigned int or something

User · Accepted Answer

From the link above      Several of these types can be modified using the keywords signed  unsigned  short  and long  When one of these type modifiers is used by itself  a data type of int is assumed   This means that you can assume the author is using ints

User · Answer

Integer Types   short            - gt  signed short signed short unsigned short int              - gt  signed int signed int unsigned int signed           - gt  signed int unsigned         - gt  unsigned int long             - gt  signed long signed long unsigned long   Be careful of char   char   is signed or unsigned depending on the implmentation  signed char unsigned char

User · Answer

You can read about the keyword unsigned in the C   Reference   There are two different types in this matter  signed and un-signed  The default for integers is signed which means that they can have negative values   On a 32-bit system an integer is 32 Bit which means it can contain a value of  4 billion   And when it is signed  this means you need to split it  leaving -2 billion to  2 billion   When it is unsigned however the value cannot contain any negative numbers  so for integers this would mean 0 to  4 billion   There is a bit more informationa bout this on Wikipedia

User · Answer

Yes  it means unsigned int   It used to be that if you didn t specify a data type in C there were many places where it just assumed int   This was try  for example  of function return types   This wart has mostly been eradicated  but you are encountering its last vestiges here   IMHO  the code should be fixed to say unsigned int to avoid just the sort of confusion you are experiencing

User · Answer

Does the unsigned keyword default to a data type in C     Yes signed and unsigned may also be used as standalone type specifiers  The integer data types char  short  long and int can be either signed or unsigned depending on the range of numbers needed to be represented  Signed types can represent both positive and negative values  whereas unsigned types can only represent positive values  and zero    An unsigned integer containing n bits can have a value between 0 and 2n - 1  which is 2n different values    However signed and unsigned may also be used as standalone type specifiers  meaning the same as signed int and unsigned int respectively  The following two declarations are equivalent    unsigned NextYear  unsigned int NextYear

[c++] Unsigned keyword in C++

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