Question: Using Java, write a program to calculate available credit. The program must prompt the user for their credit limit and the amount owing. Based on the user input, print the available credit limit.

Solution 1: Can you determine any improvements without looking at the Solution 2?

public class AvailableCredit {
    public static void main (String [] args) {
        // Create a Scanner object attached to the keyboard
        Scanner in = new Scanner (System.in);
         
        // Reading limit
        System.out.print("Enter the limit: $");
        int limit = in.nextInt();

        // Reading the owing
        System.out.print("Enter the amount owing: $");
        int owing = in.nextInt();

        // Available credit limit
        int available = limit - owing;
        System.out.print("The available credit = $" + available);
    }
}

Solution 2: This is a more refined solution that achieve the same results as the Solution 1. The variables limit, owing and available are defined at the top eliminating the need to define the variables as we go down the code. The integer variable int is replaced by double, which will allow inputs with decimal places (eg. 940.5, 119.15, etc).

public class AvailableCredit {
    public static void main (String [] args) {
        // Declare variable 
        double limit, owing, available;
        Scanner m = new Scanner (System.in);   
        
        // Requesting credit limit
        System.out.print("Enter the limit: $");        
        limit = m.nextDouble();
        
        // Requesting the owing
        System.out.print("Enter the amount owing: $");
        owing = m.nextDouble();
        
        // Available credit limit
        available = limit - owing;
        System.out.print("The available credit = $" + available);
    }
}

Output:
Enter the limit: $55.5
Enter the amount owing: $995.5
The available credit = $-940.0
User inputs are in italics are user entered values.

The public class AvailableCredit and variable names are arbitrary. This is to be expected in any programming language.