University:
University of California, Berkeley
Course:
COMPSCI 164 | Programming Languages and Compilers
Academic year:

2024
Views:

84

Pages:

4
Author:

Leilani Contreras

12/11/24, 5:56 PM Solution Reference for 1.21.1: Introduction to Programming Quiz 1.21.1: Introduction to Programming Quiz Question: 1 What does the mystery function do? function mystery() { while (noBallsPresent()) { move(); } } ✔ Karel moves until it is on a ball If there is no ball present, Karel will move one time and stop. Karel moves until it puts down a ball Karel checks if there is no ball on the current spot and then moves once Question: 2 Which of the following is not a valid condition to go in an if statement for Karel? ballsPresent() frontIsClear() leftIsBlocked() ✔ turnLeft() Question: 3 Say Karel is on a location with one tennis ball. After the following code runs, how many tennis balls will there be at that location? for (var i = 0; i < 3; i++) { if (ballsPresent()) { takeBall(); 12/11/24, 5:56 PM } Solution Reference for 1.21.1: Introduction to Programming Quiz } else { putBall(); putBall(); } 0 ✔ 1 2 6 Question: 4 What condition should be used in this while loop to get Karel to pick up all the tennis balls on the current location? while (________) { takeBall(); } noBallsPresent() ✔ ballsPresent() frontIsClear() takeBall() Question: 5 Why does a programmer indent their code? Helps show the structure of the code. Easier for other people to understand. A key part of good programming style! ✔ All of the above Question: 6 2 12/11/24, 5:56 PM Solution Reference for 1.21.1: Introduction to Programming Quiz How can we teach Karel new commands? For loop While loop ✔ Define a new function The start function Question: 7 Say you want to write a program to have Karel put down 300 tennis balls. Which control structure would you use? If statement While loop ✔ For loop Nested while loop Question: 8 Super Karel starts at Street 1, Avenue 1, facing East in a 5x5 world. What will happen after this code runs? move(); move(); turnRight(); move(); Karel ends on street 1, avenue 3 Karel ends on street 2, avenue 3 This code won’t run because of a syntax error ✔ Karel will crash into a wall Question: 9 Karel starts at Street 1, Avenue 1, facing East in a 5x5 world. What will happen after this code runs? 3 12/11/24, 5:56 PM Solution Reference for 1.21.1: Introduction to Programming Quiz move(); putball(); move(); move(); move(); move(); move(); Karel will end on Street 1, Avenue 2 Karel will end on Street 1, Avenue 7 ✔ This code won’t run because of a syntax error Karel will crash into a wall Question: 10 What is top down design? ✔ Top down design is a way of designing your program by starting with the biggest problem and breaking it down into smaller and smaller pieces that are easier to solve. Top down design is a way that you can create designs on a computer to put on a web page Top down design is a way of designing your programs starting with the individual commands first Top down design is a way to use loops and if statements to decompose the problem Question: 11 How can we improve the following program? function start() { move(); move(); move(); move(); move(); move(); move(); 4