Question

Q3. (15 marks)using c/c++

Write a COMPLETE Console Application that allows user to work with a database of 20 numbers. The program should:

• Creates an initial array of size 20.
  • At the start, all of the locations in the array are considered empty (available)
  • Hint: Have a variable that shows how many numbers are in the array. It will be zero at first, and it changes based on the operations.
• Show a menu to user with these options:
  • List the existing numbers
    • Do not show empty available locations
  • Add a number to the array
    • This number goes to the first available location. Nothing will be added if array is full.
  • Insert a number at a given location in the array.
    • All numbers after the given location will be shifted towards the end. For example, [1 3 6 8 7], by inserting a 0 at location 2 will be [1 3 6 0 8]. The last number will be lost.
    • If the location to insert is more than the first available location, then the number will be inserted at the first available location. For example, if the array is [1 3 6 x x] and x are empty locations, inserting a 5 at location 4 will result in [1 3 6 5 x] instead of [1 3 6 x 5]
  • Delete the number at the given location.
    • This will remove the number and shift all the numbers after it down. For example, deleting 5 from this array [1 3 5 7 9] will result in [1 3 7 9 x]. Note that if we shift down the last member, it will become empty/available.
  • Exit the program
• Perform the actions

Answer 1

C++ CODE:

#include<iostream>
using namespace std;
int main()
{
int arr[20];
int count=0;
while(true)
{
cout<<endl;
cout<<"1: List the existing numbers"<<endl;
cout<<"2: Add a number to the array"<<endl;
cout<<"3: Insert a number at a given location in the array: "<<endl;
cout<<"4: Delete the number at the given location"<<endl;
cout<<"5: Exit the program"<<endl;
cout<<"Enter choice: ";
int choice;
cin>>choice;
if(choice==1)
{
for(int i=0;i<count;i++)
cout<<arr[i]<<" ";
cout<<endl;
}
else if(choice==2)
{
if(count!=20)
{
int i;
cout<<"Enter number: ";
cin>>i;
arr[count++]=i;
}
}
else if(choice==3)
{
int loc,i;
cout<<"Enter location: ";
cin>>loc;
cout<<"Enter number: ";
cin>>i;
if(loc>=count)
arr[count++]=i;
else
{
for(int j=count-1;j>=loc;j--)
arr[j+1]=arr[j];
arr[loc]=i;
count++;
}
}
else if(choice==4)
{
int loc,i;
cout<<"Enter location: ";
cin>>loc;
for(int i=loc;i<count;i++)
arr[i]=arr[i+1];
count--;
}
else
break;
}

}
Output: