Question

suppose you have allocated an array of twenty doubles, called values, on the heap. Write the line of code (including the semicolon) to free up the memory when the array is no longer needed.

c code

Answer 1

Dynamic memory is allocted in heap in the program.

So code to allocate dynamic memory in the heap as mentioned in question is like:

double *values;

values = malloc(20 * sizeof(double));

So now one can put values in it by using simply values[0], values[1]....values[19]

To free the dynamically allocated memory in heap one can use free() function.

Code to free the memory dynamically allocated in the above code is like:

free(values);

values=NULL;

Assigning Null to the pointer after the deallocation is not necessary but it is a good practice.