C++ LANGUAGE DYNAMIC MEMORY ALLOCATION FOR ARRAY

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C++ LANGUAGE DYNAMIC MEMORY ALLOCATION FOR ARRAY

Dynamic Memory Allocation for Arrays 


Consider you want to allocate memory for an array of characters, i.e., 
string of 20 characters. Using the same syntax what we have used above 
we can allocate memory dynamically as shown below. 

char* pvalue  = NULL;   // Pointer initialized with null 

pvalue  = new char[20]; // Request memory for the variable 

To remove the array that we have just created the statement would look like this: 

delete [] pvalue;        // Delete array pointed to by pvalue 

Following the similar generic syntax of new operator, you can 
allocate for a multi-dimensional array as follows: 

double** pvalue  = NULL;     // Pointer initialized with null 

pvalue  = new double [3][4]; // Allocate memory for a 3x4 array 

However, the syntax to release the memory for multi-dimensional 
array will still remain same as above: 

delete [] pvalue;        // Delete array pointed to by pvalue