Question

9. Write some C++ code that will fill an array a with 20 values of type int read in from the keyboard. You need not write a full program, just the code to do this, but do give the declarations for the array and for all variables.

10. Suppose you have the following array declaration in your program:

int your_array[7];

Also, suppose that in your implementation of C++, variables of type int use two bytes of memory. When you run your program, how much memory will this array consume? Suppose that when you run your program, the system assigns the memory address 1000 to the indexed variable your_array[0].

What will be the address of the indexed variable your_array[3]?

Answer 1

9.

// C++ program to input 20 number from keyword
# include <iostream>
using namespace std;

int main()
{
   int arr[20] ; // declare an array of 20 elements
   int i;
   // loop to input 20 numbers from keyboard
   for(i=0;i<20;i++)
   {
       cout<<"Enter element-"<<(i+1)<<" : ";
       cin>>arr[i];
   }
   return 0;
}

10.

int your_array[7];
In C++ variables of type int use two bytes of memory.
The above array your_array is of size 7. Since each int uses 2 bytes of memory, therefore 7 int value will occupy 7*2 = 14 bytes of memory.
your_array will consume 14 bytes of memory.
your_array[0] is assigned the memory address 1000
Each value of your_array will consume 2 bytes of memory (since type is int).
your_array[3] will point to 4th element of array. Address of your_array[3] = 1000 + 2*3 = 1000+6 = 1006