Why would you use an array of pointers to pointers?
Table of Contents
- 1 Why would you use an array of pointers to pointers?
- 2 Can you return a pointer to an array in C?
- 3 Is returning a function pointer possible in C?
- 4 What is an array of pointers in C?
- 5 What is a dynamic array in C?
- 6 Which function returns the lower value of an array?
- 7 What is the difference between pointer to an array and array of pointers?
- 8 Which of the following is correct declaration for a pointer to a function that returns a float?
- 9 How to read complicated declarations in C programming?
- 10 What is a void pointer in C programming?
- 11 What is a pointer variable in C++?
Why would you use an array of pointers to pointers?
An array of pointers is useful for the same reason that all arrays are useful: it allows you to numerically index a large set of variables. Below is an array of pointers in C that points each pointer in one array to an integer in another array. The value of each integer is printed by dereferencing the pointers.
Can you return a pointer to an array in C?
C programming does not allow to return an entire array as an argument to a function. However, you can return a pointer to an array by specifying the array’s name without an index.
Can we return an array of object using pointer?
Return Array from Functions in C++ C++ does not allow to return an entire array as an argument to a function. However, you can return a pointer to an array by specifying the array’s name without an index.
Is returning a function pointer possible in C?
Pointers in C programming language is a variable which is used to store the memory address of another variable. We can pass pointers to the function as well as return pointer from a function.
What is an array of pointers in C?
It is collection of addresses (or) collection of pointers.
How the array can be handled by the pointer in C?
When an array in C language is declared, compiler allocates sufficient memory to contain all its elements. Its base address is also allocated by the compiler. Variable arr will give the base address, which is a constant pointer pointing to arr[0] . Hence arr contains the address of arr[0] i.e 1000 .
What is a dynamic array in C?
A dynamic array is an array with a big improvement: automatic resizing. One limitation of arrays is that they’re fixed size, meaning you need to specify the number of elements your array will hold ahead of time. A dynamic array expands as you add more elements.
Which function returns the lower value of an array?
min() function
The min() function returns the lowest value in an array, or the lowest value of several specified values.
Can we access the array using a pointer in C language?
we can access the array elements using pointers.
What is the difference between pointer to an array and array of pointers?
A user creates a pointer for storing the address of any given array. A user creates an array of pointers that basically acts as an array of multiple pointer variables. It is alternatively known as an array pointer.
Which of the following is correct declaration for a pointer to a function that returns a float?
Discussion Forum
| Que. | Declare the following statement? “A pointer to a function which receives an int pointer and returns float pointer”. |
|---|---|
| b. | float *(*ptr)(int) |
| c. | float *(*ptr)(int*) |
| d. | float (*ptr)(int) |
| Answer:float *(*ptr)(int*) |
How do I return a pointer array?
Returning pointer pointing to the array
- #include
- int *getarray()
- {
- int arr[5];
- printf(“Enter the elements in an array : “);
- for(int i=0;i<5;i++)
- {
- scanf(“\%d”, &arr[i]);
How to read complicated declarations in C programming?
Most of the times declarations are simple to read, but it is hard to read some declarations which involve pointer to functions. For example, consider the following declaration from “signal.h”. Let us see the steps to read complicated declarations. 1) Convert C declaration to postfix format and read from right to left.
What is a void pointer in C programming?
Void pointers are of great use in C. Library functions malloc () and calloc () which dynamically allocate memory return void pointers. qsort (), an inbuilt sorting function in C, has a function as its argument which itself takes void pointers as its argument. A dangling pointer points to a memory address which used to hold a variable.
How to declare an array of pointers to an integer?
Following is the declaration of an array of pointers to an integer − It declares ptr as an array of MAX integer pointers. Thus, each element in ptr, holds a pointer to an int value. The following example uses three integers, which are stored in an array of pointers, as follows −
What is a pointer variable in C++?
* – A pointer variable is a special variable in the sense that it is used to store an address of another variable. To differentiate it from other variables that do not store an address, we use * as a symbol in the declaration.