We’ve already found the Contract for gt, generated Examples and described the pattern with a Function Definition. Let’s review our process, beginning with the Word Problem.

Define a function called gt, which makes solid green triangles of whatever size we want.

Contract and Purpose Statement

Every contract has three parts…​

gt: Number->Image

Consumes a size, and produces a solid green triangle of that size.

Examples

Write some examples, then circle and label what changes…​

(EXAMPLE (gt 10)(triangle 10 "solid" "green"))

(EXAMPLE (gt 20)(triangle 20 "solid" "green"))

Definition

Write the definition, giving variable names to all your input values…​

(define (gt size)

__(triangle size "solid" "green"))

Now, let’s apply the same steps to think through a new problem!

Define a function called bc, which makes solid blue circles of whatever radius we want.

Contract and Purpose Statement

Every contract has three parts…​

__:_______->_____

_

Examples

Write some examples, then circle and label what changes…​

(EXAMPLE (__ __)__________________________)

(EXAMPLE (__ __)__________________________)

Definition

Write the definition, giving variable names to all your input values…​

(define (__ _______)

________________________________)

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). CCbadge Bootstrap by the Bootstrap Community is licensed under a Creative Commons 4.0 Unported License. This license does not grant permission to run training or professional development. Offering training or professional development with materials substantially derived from Bootstrap must be approved in writing by a Bootstrap Director. Permissions beyond the scope of this license, such as to run training, may be available by contacting contact@BootstrapWorld.org.