How do you create an array with user input size?

1. #include
2. int main()
3. {
4. int size=0;
5. int arr[size];
6. printf(“input size of array “);
7. scanf(“\%d”,&size);
8. printf(“\ninput elements of array “);

How do you declare an array by specifying size?

The usual way of declaring an array is to simply line up the type name, followed by a variable name, followed by a size in brackets, as in this line of code: int Numbers[10]; This code declares an array of 10 integers.

Can you use variables to set the size of an array?

Variable length arrays is a feature where we can allocate an auto array (on stack) of variable size. C supports variable sized arrays from C99 standard. For example, the below program compiles and runs fine in C.

How can I give an array size through a user input in Java?

ArrayInputExample2.java

1. import java.util.Scanner;
2. public class ArrayInputExample2.
3. {
4. public static void main(String args[])
5. {
6. int m, n, i, j;
7. Scanner sc=new Scanner(System.in);
8. System.out.print(“Enter the number of rows: “);

Why is it necessary to give the size of an array in an array declaration?

We need to give the size of the array because the complier needs to allocate space in the memory which is not possible without knowing the size. Compiler determines the size required for an array with the help of the number of elements of an array and the size of the data type present in the array.

Can you change the size of the array once you define it or can you insert or delete the elements after creating an array and why?

If you create an array by initializing its values directly, the size will be the number of elements in it. Thus the size of the array is determined at the time of its creation or, initialization once it is done you cannot change the size of the array.

Can we create an array without specifying size?

Answer: No. It is not possible to declare an array without specifying the size. If at all you want to do that, then you can use ArrayList which is dynamic in nature.

How do you make an array without size in Java?

How you will Declare an array in java without size? You can do it with an ArrayList, It’s a collection framework used in Java that serves as dynamic data. ArrayList array = new ArrayList(); Here is an example code Java Array without a size.

How to create an array of any length in C?

This way an array can be created of any length. Program will ask user to enter the size of the array and program will allocate memory of total size = number of elements * size of 1 int. Program will allocate the the memory and then ask user to enter elements to fill the array.

Why do I have to define a specific size for arrays?

One thing to note is that I have created the array after i took input from the user. This is because during definition of an array, a specific size must be defined so that the required amount of memory can be alloted to the array.

How to create an array with a dynamic size at runtime?

Since you want to create an array whose size is to be determined at runtime (“dynamically”), you should use one of the standard C functions for dynamic memory allocation, such as calloc which allocates memory and zero-initializes it.

Can an array be variably sized in C++?

Vector is a good choice most of the time. No, arrays cannot be variably sized in C++. The code you have there will not compile, because the value of a constant has to be evaluated at compile-time. You might try the std::vector class instead and use the resize method, or pass the size through the constructor.