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cplusplus:c_vs._c

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cplusplus:c_vs._c [2016/04/21 23:11] – [Named constants (macros)] mithatcplusplus:c_vs._c [2016/04/21 23:35] – [Structs] mithat
Line 78: Line 78:
 ===== Named constants and macros ===== ===== Named constants and macros =====
   * ''const'' is available only in newer versions of C.   * ''const'' is available only in newer versions of C.
-  * ''#define'' precompiler directive typically used for named constants.<code c>+  * ''#define'' precompiler directive typically used instead.<code c>
 #define PI 3.1415 #define PI 3.1415
 #define TAX_RATE 0.065 #define TAX_RATE 0.065
Line 86: Line 86:
 </code> </code>
  
-===== Dynamic memory =====+===== Dynamic memory is different =====
  
-  * Allocating/deallocating dynamic memory is different. +  * Allocating memory:<code c> 
-<code c> +int *x = malloc(sizeof(int));          /* allocate a single int */ 
-int *x = malloc(sizeof(int));            /* allocate a single int */ +int *xArry = malloc(sizeof(int) * 10); /* allocate array of ints */
-int *x_array = malloc(sizeof(int) * 10); /* allocate array of 10 ints */ +
- +
-/* release storage that was allocated */ +
-free( x ); +
-free( x_array );+
 </code> </code>
  
 +  * Deallocating memory:<code c>
 +free(x);
 +free(xArry);
 +</code>
 ===== Structs ===== ===== Structs =====
-  * Need to use ''struct'' keyword when defining ''struct'' variables.<code c>+  * You must use the ''struct'' keyword when defining ''struct'' variables.<code c>
 struct MyStruct struct MyStruct
 { {
cplusplus/c_vs._c.txt · Last modified: 2016/04/22 01:10 by mithat

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