Function in C++ || Project OPTIMIZATION

 Function in C++

Functions are used to perform certain actions, and they are important for reusing code: Define the code once and use it many times. It also enables programmers to break down or decompose a problem into smaller chunks, each of which performs a particular task.

For our projects, we will start off by performing the task below. Try to do this on your own before seeing the final answer.

• Create a deposit function
• Declare a variable inside the function with a value of 1000.
• Accept user integer input.
• Add to the existing variable of 1000.
• Display the final result.

For the other function,

• Create a withdraw function
• Declare a variable inside the function with a value of 1000.
• Accept user integer input.
• Subtract from the existing variable of 1000.
• Display the final result.

#include<bits/stdc++.h>

using namespace std;

int Deposit()

{

    int existing_amount = 1000,amt;

    cout<<endl<<"Enter how much to Deposit - ";

    cin>>amt;

    amt+=existing_amount;

    return amt;

}

int Withdraw()

{

    int existing_amount = 1000,req;

    cout<<endl<<"Enter how much to Withdraw - ";

    cin>>req;

    existing_amount-=req;

    return existing_amount;

}

int main()

{

    string username;

    cout<<"Enter your username - ";

    cin>>username;

    

    cout<<endl;

    

    cout<<"Welcome to ABC Online Banking "<<username<<endl<<endl;

    

    cout<<"What would you like to do?"<<endl;

    cout<<"1.Deposit"<<endl;

    cout<<"2.Withdraw"<<endl;

    cout<<"3.Loans"<<endl;

    cout<<"4.Credit Score"<<endl;

    

    int dothis;

    

    cout<<"Enter your option - ";

    cin>>dothis;

    

    //dothis=1 assigns, dothis==1 checks

    if(dothis==1)

    {

        cout<<endl<<"You selected Deposit"<<endl;

        int final_amt=Deposit();

        cout<<endl<<"Your final amount is - "<<final_amt<<endl;

    }

    else if(dothis==2)

    {

        cout<<endl<<"You selected Withdraw"<<endl;

        int final_amt=Withdraw();

        cout<<endl<<"Your final amount is - "<<final_amt<<endl;

    }

    else if(dothis==3)

    {

        cout<<endl<<"You selected Loans"<<endl;

    }

    else

    {

        cout<<endl<<"You selected Credit Score"<<endl;

    }

    //there will be changes eventually

}

The output would look something like this -

Here is the problem, some test cases have issues, like this one -

Can you try and fix it?