Final answer:
The question relates to a Java program performing a simple addition operation. The code outputs the sum of two positive numbers, demonstrating basic arithmetic principles within a computer programming context. Rules regarding addition, subtraction, and rounding numbers provide further insight into handling arithmetic in programming and mathematics.
Step-by-step explanation:
The code snippet provided is an example of a simple arithmetic operation within a Java program. When executed, this line of code will perform the addition of two positive numbers and output the result. The output, "Answer: 7", shows that the operation 2 + 5 has been correctly evaluated to 7.
In general, when performing arithmetic operations, there are rules to consider for different scenarios:
- Two positive numbers added together will result in a positive sum, such as 3+2 = 5.
- Two negative numbers added together will provide a negative sum, for example, -4 + (-2) = -6.
- Adding two numbers with opposite signs involves subtracting the smaller number from the larger one, assigning the sign of the larger number to the result, like in -5 +3 = -2.
- For subtraction, the sign of the number being subtracted is changed, and the result follows addition rules, as seen in 5-(+3) = 2 and 2-(-6)=2+6 = 8.
Additionally, rules for rounding numbers are important in calculations. For instance, when rounding to the hundredths place, if the first digit to be dropped is greater than 5, the last retained digit is increased by one. A practical example given is rounding 201.867 to 201.87 because the digit following the hundredths place is 7.