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Arrays - Programming

Q1:

Which of the following statements are correct about the program below? 
#include<stdio.h>

int main()
{
    int size, i;
    scanf("%d", &size);
    int arr[size];
    for(i=1; i<=size; i++)
    {
        scanf("%d", arr[i]);
        printf("%d", arr[i]);
    }
    return 0;
}

A The code is erroneous since the subscript for array used in for loop is in the range 1 to size.

B The code is erroneous since the values of array are getting scanned through the loop.

C The code is erroneous since the statement declaring array is invalid.

D The code is correct and runs successfully.

ANS:C - The code is erroneous since the statement declaring array is invalid.

The statement int arr[size]; produces an error, because we cannot initialize the size of array dynamically. Constant expression is required here. Example: int arr[10]; One more point is there, that is, usually declaration is not allowed after calling any function in a current block of code. In the given program the declaration int arr[10]; is placed after a function call scanf().