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AP Computer Science Semester 1 Final Exam with correct Answers
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AP Computer Science Semester 1 Final Exam
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AP Computer Science Semester 1 Final ExamWhich is the hexadecimal representation of the binary number 0010 110 1011 1111? - Answer -2CBF
Each 4 digit binary number translates to a single hexadecimal digit. Any value higher than 9 will result in an uppercase letter starting from A.
What are the binary numbers up to the 8th place value? - Answer -128 64 32 16 8 4 2 1
You can solve this for any amount of place values by using the equation 2^n, where n is
the place value. You start with 0 and work your way up to the last place value. This works for other bases such as base 4 as well, just replace the 2 with the new base number.
What is the output of the following program statement?
System.out.println("Total: " + 8 + 3); - Answer -Total: 83
Because the statement starts with a String, the numbers are simply concatenated, not added together.
How many different values can be represented in 7 bits? - Answer -128
You can figure this out for any amount of bits by the equations 2^n, where n is the number of bits.
What is the decimal (base 10) value of the base 4 number 123? - Answer -27
Base 4 place values can be found similarly to binary, where you use 4^n and then solve the number, which would be 1**16 + 2**4 + 3**1 = 27.
Java is platform independent because of the... - Answer -JVM.
What is a JVM? - Answer -A Java Virtual Machine. Each platform has its own JVM that translates bytecode for that platform.
What kind error occurs when you use the wrong formula to calculate the area of a circle? - Answer -Logic error. This is because the machine compiles and has a valid value, but the answer is not correct because of the equation in the program. What kind of error occurs when you misspell a Java keyword or forget a semicolon? - Answer -Compiler error. This is because there is an error in syntax.
What kind of error occurs when you try to send a Bug outside of a grid in GridWorld? - Answer -Runtime error. A program has to do 2 things when it is run by the user, compile
and run. When moving the bug, it gives a value and passes through the compiler. The value is technically valid because it is a coordinate, so that means the compiler can let it
pass through. This can happen when you put in a correct value, but it is out of the range
of possible values. Imagine going to the grocery store and you want to go to aisle 6, but there are only 5 aisles. You can head towards "aisle 6" thinking it exists, but once you get there you realize it's not a valid value. Basically, it is a logical value, but is it not possible to get to.
When you compile your Java program, what is produced besides the output? - Answer -
A bytecode file. The *.class file is bytecode. It is not directly executable. It is translated by the JVM at runtime.
What are some examples of primary memory? - Answer -RAM (Random Access Memory). It is volatile, so if the power shuts off, the memory stored within it is not saved.
What are some examples of secondary memory? - Answer -Hard drive, CD-ROM, Flash
drive, etc. These do not need power in order to continue to store memory.
What are some examples of high-level languages? - Answer -Java, Pascal, C++, COBOL, Fortran, etc.
What are some examples of low-level languages? - Answer -Assembly language, machine code
What is the numeric value of the following expression?
Math.min(Math,pow(2,3),7) - Answer -7
First, it will call Math.pow, which values to 2^3 which values to 8. 8 is bigger than 7, so 7
is the min.
Operators
What is stored in result after the following statement?
double result = 35 % 40; - Answer -35.0
% is modulus, which means the answer is the remainder if the two numbers were divided. Because 35 is less than 40, the remainder is 35. It is also stored as a double, so you need to include the decimal point.
What is stored in result after the following statement?
double results = ; - Answer -6.0
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