Final answer:
To test the calculation of the 'result' variable in a program, place a debug output statement immediately after the result is calculated. This helps verify the correctness of the calculation and isolate potential errors.
Step-by-step explanation:
To test the calculation of the result variable in a program, a debug output statement should be placed immediately after the result is computed. By placing the debug statement after the calculation, you can output the variable's value to verify its correctness. For instance, if the calculation is result = a + b;, you would insert a print statement such as System.out.println("Debug: result = " + result); directly following this line of code.
If the program is complex and there are multiple operations that could affect the result variable's value, you might need to place additional debug statements after each operation that could potentially influence the outcome. This methodical approach helps in narrowing down where an error might be occurring if the result is not what is expected. These debug statements serve as checkpoints to ensure the correct values are being calculated and carried through each step of the program.