Modifying a member variable [closed] - c++

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I'm having an issue with modifying a member of a class. I overloaded the operators and I think that I am calling the member correctly to modify it but am getting the issue that the "expression must be a modifiable l-value.
Any help would be appreciated
.h file
public:
account& operator+= (float x);
account& operator-= (float y);
float set_balance();
.cpp file
account& account::operator+=(float x)
{
this->acct_balance += x;
return *this;
}
account& account::operator+=(float y)
{
this->acct_balance -= y;
return *this;
}
float account::set_balance()
{
return this->acct_balance;
}
main file
//deposit
else if (imput == 2)
{
float deposit;
cout << "Please enter the amount to deposit: ";
cin >> deposit;
user1.set_balance() += deposit;
}
//withdrawl
else if (imput == 3)
{
float withdraw;
cout << "Please enter the amount to deposit: ";
cin >> withdraw;
user1.set_balance() += withdraw;
}

Answer 1

Your set_balance function doesn't set anything. You probably want this:
float& account::get_balance()
{
return this->acct_balance;
}
Then you can do user1.get_balance() += withdraw;.
This get_balance function gets the balance as a modifiable l-value, which is what you need.
Since you have an operator+=, you could also just do user1 += withdraw;.