Single quotes vs double quotes in C or C

Question

When should I use single quotes and double quotes in C or C   programming

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A single quote is used for character  while double quotes are used for strings  For example     printf  quot  c  n quot   a     printf  quot  s quot   quot Hello World quot     Output a   Hello World  If you used these in vice versa case and used a single quote for string and double quotes for a character  this will be the result    printf  quot  c  n quot   quot a quot      printf  quot  s quot   Hello World     output   For the first line  You will get a garbage value or unexpected value or you may get an output like this     While for the second statement  you will see nothing  One more thing  if you have more statements after this  they will also give you no result  Note  PHP language gives you the flexibility to use single and double-quotes easily

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In C  amp  C   single quotes is known as a character   a   whereas double quotes is know as a string   quot Hello quot    The difference is that a character can store anything but only one alphabet number etc  A string can store anything  But also remember that there is a difference between  1  and 1  If you type cout lt  lt  1  lt  lt endl lt  lt 1  The output would be the same  but not in this case  cout lt  lt int  1   lt  lt endl lt  lt int 1    This time the first line would be 48  As when you convert a character to an int it converts to its ascii and the ascii for  1  is 48  Same  if you do  string s  quot Hi quot   s  48    This will add  quot 1 quot  to the string s   quot 1 quot   This will also add  quot 1 quot  to the string

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Use single quote with single char as   char ch    a     here  a  is a char constant and is equal to the ASCII value of char a   Use double quote with strings as   char str      foo     here  foo  is a string literal   Its okay to use  a  but its not okay to use  foo

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Some compilers also implement an extension  that allows multi-character constants  The C99 standard says      6 4 4 4p10   The value of an integer character constant containing more   than one character  e g    ab    or   containing a character or escape   sequence that does not map to a   single-byte execution character  is   implementation-defined     This could look like this  for instance   const uint32 t png ihdr    IHDR     The resulting constant  in GCC  which implements this  has the value you get by taking each character and shifting it up  so that  I  ends up in the most significant bits of the 32-bit value  Obviously  you shouldn t rely on this if you are writing platform independent code

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x  is an integer  representing the numerical value of the  letter x in the machine   s character set  x  is an array of characters  two characters long   consisting of    x    followed by     0

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Single quotes are characters  char   double quotes are null-terminated strings  char      char c    x   char  s    Hello World

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I was poking around stuff like  int cc    cc   It happens that it s basically a byte-wise copy to an integer  Hence the way to look at it is that  cc  which is basically 2 c s are copied to lower 2 bytes of the integer cc  If you are looking for a trivia  then  printf   d  d    c    cc    would give    99 25443  that s because 25443   99   256 99  So  cc  is a multi-character constant and not a string   Cheers

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Single quotes are denoting a char  double denote a string    In Java  it is also the same

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Single quotes are for a single character  Double quotes are for a string  array of characters   You can use single quotes to build up a string one character at a time  if you like   char myChar        A   char myString      Hello Mum   char myOtherString        H   e   l   l   o    0

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Double quotes are for string literals  e g    char str      Hello world     Single quotes are for single character literals  e g    char c    x     EDIT As David stated in another answer  the type of a character literal is int

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In C  single-quotes such as  a  indicate character constants whereas  quot a quot  is an array of characters  always terminated with the  0 character

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single quote is for character  double quote is for string

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In C and in C   single quotes identify a single character  while double quotes create a string literal   a  is a single a character literal  while  a  is a string literal containing an  a  and a null terminator  that is a 2 char array    In C   the type of a character literal is char  but note that in C  the type of a character literal is int  that is sizeof  a  is 4 in an architecture where ints are 32bit  and CHAR BIT is 8   while sizeof char  is 1 everywhere

[c++] Single quotes vs. double quotes in C or C++

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