Manual Output

Another tried-and-true debugging technique involves putting extra print statements in your program.

Print a message to indicate that the program has reached some specific point correctly.

amountDue = amountDue - payment;
System.out.println("We got past the calculation");

Print the contents of variables to see if they contain the values you expect at a particular point in your program.

amountDue = amountDue - payment;
System.out.println("value: " + amountDue);

Once the print statements have served their purpose, you remove them and recompile the program.

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