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cplusplus:c_versus_cplusplus

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cplusplus:c_versus_cplusplus [2020/05/04 01:15] – [Structs] mithatcplusplus:c_versus_cplusplus [2020/05/04 01:40] – [Some C Resources] mithat
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 ===== Strings ===== ===== Strings =====
-  * Use null-terminated character arrays. 
-  * Use functions in ''[[https://pubs.opengroup.org/onlinepubs/009695399/basedefs/string.h.html|string.h]]'' to manipulate strings. 
-    * C's ''[[https://pubs.opengroup.org/onlinepubs/009695399/basedefs/string.h.html|string.h]]'' and C++'s ''[[http://www.cplusplus.com/reference/cstring/|cstring]]'' are essentially duplicates. 
 <code c> <code c>
-#include <string.h>+#include <string.h>       /* needed to use strlen() function */
  
 int main(void) { int main(void) {
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   ...   ...
 </code> </code>
 +  * Use null-terminated character arrays. 
 +  * Use functions in ''[[https://pubs.opengroup.org/onlinepubs/009695399/basedefs/string.h.html|string.h]]'' to operate on strings. 
 +    * C's ''[[https://pubs.opengroup.org/onlinepubs/009695399/basedefs/string.h.html|string.h]]'' and C++'s ''[[http://www.cplusplus.com/reference/cstring/|cstring]]'' are essentially duplicates.
 ===== Defining variables ===== ===== Defining variables =====
-  * In older versions of C, you //must// define variables at the beginning of a function. 
-  * Common practice today anyway. 
 <code c> <code c>
 int  main( ) int  main( )
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     int a,b,c;     int a,b,c;
     float x,y,z;     float x,y,z;
 +    
     ...     ...
 +}
 </code> </code>
-   +  * In older versions of C, you must define all variables at the beginning of a function. 
 +  * Common practice today anyway.
 ===== Prototypes ===== ===== Prototypes =====
-  * Function prototypes are not required. 
-  * Best practice to use them anyway. 
 <code c> <code c>
 /* int foo(); <--optional */ /* int foo(); <--optional */
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 </code> </code>
  
 +  * Function prototypes are not required. 
 +  * Best practice to use them anyway.
 ===== Named constants and macros ===== ===== Named constants and macros =====
-  * ''const'' is available only in newer versions of C.+  * ''const'' modifier is available only in newer versions of C.
   * ''#define'' preprocessor directive typically used instead.<code c>   * ''#define'' preprocessor directive typically used instead.<code c>
 #define PI 3.1415 #define PI 3.1415
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 ===== Casting ===== ===== Casting =====
-  * No ''static_cast<>'', etc. 
-  * Place the type you want a value cast to inside parenthesis before the value. 
 <code c> <code c>
 int myInt = 42; int myInt = 42;
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 myDouble = (double)myInt/3;  /* cast myInt to a double */ myDouble = (double)myInt/3;  /* cast myInt to a double */
 </code> </code>
 +  * Place the type you want a value cast to inside parenthesis before the value.
 +  * No ''static_cast<>'', etc.
  
 ===== Dynamic memory ===== ===== Dynamic memory =====
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 ===== Structs ===== ===== Structs =====
-  * Only member variables are allowed. No member functions. 
-  * Everything is public. No access specifiers. 
-  * You must use the ''struct'' keyword when defining ''struct'' variables. 
- 
 <code c> <code c>
 struct MyStruct struct MyStruct
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 struct MyStruct aStructInstance;  /* requires struct keyword */ struct MyStruct aStructInstance;  /* requires struct keyword */
 </code> </code>
 +  * Only member variables are allowed.
 +    * No member functions.
 +  * Everything is public.
 +    * No access specifiers.
 +  * You must use the ''struct'' keyword when defining ''struct'' variables.
 +
 +
  
 ===== Classes ===== ===== Classes =====
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 ===== Some C Resources ===== ===== Some C Resources =====
  
-  * [[https://www.math.brown.edu/~jhs/ReferenceCards/CRefCard.v2.2.pdf|C Reference Card (ANSI)]] +  * [[https://www.math.brown.edu/~jhs/ReferenceCards/CRefCard.v2.2.pdf|C Reference Card (ANSI)]] Highly recommended! 
-  * A [[http://www.tutorialspoint.com/cprogramming/|C Tutorial]] from Tutorials Point+  * [[C examples|C code examples]]
  
 ===== C Examples ===== ===== C Examples =====
   * Look [[C examples|here]].   * Look [[C examples|here]].
cplusplus/c_versus_cplusplus.txt · Last modified: 2020/05/04 01:40 by mithat
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