Then we want to return this product as the answer to fact 5. If you are having a hard time identifying how the if statement and if function differ, first try to get them to print out different values. You can grab a template for this homework either by downloading the file from the calendar or by running the following. Define intersect , which returns a set containing only values that appear in both sets s and t. To fix this, we need to use tail recursion! Your implementation should run in linear time in the length of the input sets.

OK autogrades programming assignments, facilitates submission, composition feedback, and analytics for your class. Solutions for Homework 3. Using cond , define a procedure sign that returns -1 for negative arguments, 0 for zero, and 1 for positive arguments:. Consider the following observations: It returns a representation of a set containing the values in s and the value v.

You might find the following references useful: When you are done, submit with python3 ok –submit. We do not require a paper.

Implement the procedure nodotswhich takes a nested list of numbers that may not be well-formed and returns a nested list with the same content and structure, but which does not have homewokr dots when displayed.

In such cases, the list will print with a dot before the final item to indicate that its last two items are contained in a single pair.

## Homework Questions

Write a function filterwhich takes in a predicate and a Scheme list and returns a Scheme list whose elements are the elements from the inputted Scheme list that satisfy the predicate. Therefore, even if c returns Falsethe function t will be called.

View Demo Student Login. Notice that in this version of factorialthe return expressions both use recursive calls, and then use the values for more “work. Then the current frame can use that value to calculate the final answer.

A Python implementation of this procedure is provided for your reference. You can grab a template for this homework either by downloading the file from the calendar or by running the following.

Using conddefine a procedure sign that returns -1 for negative arguments, 0 for zero, and 1 for positive arguments:. The number n will travel up and down but eventually end at 1 at least for all numbers that have ever been tried — nobody has ever proved that the sequence will terminate.

Fill in the blanks in the following function definition for adding a to the absolute value of b, without calling abs. Numbers are considered nondescending if they are in a monotonically increasing sequence, that is:. Cadr and Caddr Conditional expressions Q2: If no clause has a true predicate, the result is an “unspecified value”.

Lists are not well-formed if they do not properly terminate in a null list. There should be no repeated elements in the return value.

Question 1; Question 2; Question. In such cases, the list will print with a dot before the final item to indicate that its last two items are contained in a single pair. This homework must be submitted online.

To fix this, we need to use tail recursion! For this set of problems. If you have any questions about using Ok, please refer to this guide.

# Homework 1 Solutions | CS 61A Summer

Scheme Specification Scheme Primitives Reference 2. See Lab 1 for submission instructions.

Sets as Ordered Lists Q6: We notice that in Python we can do this with a while loop:. Conditional expressions are evaluated as follows: We have provided a hw8.

Contribute to cs61a development by xs61a an account on GitHub. Look at the solution for the homework version of this problem – it is attached to the back of the exam 2.

You can find the file with solutions for all questions here. The general form of a conditional expression is: