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Expressions and assignment
We can think of most computer programs as performing some sort of transformation on data. Our code may get as input the exam scores of everyone in the class and generates the average score as output. Or, in a transducer architecture, we may think about writing the program that takes the current memory state of the transducer and an input, and calculates a new memory state and output.
To represent data in a computer, we have to code it, ultimately as sequences of binary digits (0s and 1s). The primary memory of a computer is spited into 'words', which typically hold 32 or 64 bits; a word can be used to save a number, one or various characters, or a pointer to (the address of) another memory location.
A computer program, at the lowest section, is a set of primitive statement, also encoded into bits and saved in the words of the computer's memory. These instructions defines operations to be operated on the data (and sometimes the program itself) that are stored in the computer's memory. In that class, we will not do at the part of these low-level instructions: a high-level programming language such as Python lets us abstract away from these information. But it is very important to have an abstract model of what is going on within the computer.
Primitives, Composition, Abstraction, and Patterns We will start by thinking about how the PCAP framework applies to computer programs, in general. We may do that by
A program to count how many files are on the file system which displays summary information regarding the total number of bytes used by all files and a breakdown of the number of b
Write an algorithm for a program that receives, as input from the user, 2 string variables and 2 integer variables; then joins together and displays the combined strings; and final
There are three seating categories at a stadium. For a softball game, Class A seats cost $15, Class B seats cost $12, and Class C seats cost $9. Write a program that asks how many
1 Low Level Exploits 1.1 Savegames Jimmy is becoming increasingly frustrated at the computer game hes playing. He has a save right before the levels boss but he needs either more
Use the function to compute and print the sum of first n prime numbers.
Non-local references So far, whenever we needed to compute a variable, there was a binding for that variable in the 'local' environment (the environment in which we were e
Worked example 1 Let's examine what happens when we compute the following Python code: def p(x, y): z = x*x - y return z + 1/z >>> p(1.0, 2.0) -2.0
an array A[0..n-1] of nr red elements, nw white elements and nb blue elements in random order such that 0 = nr,nw,nb = n and nr + nw + nb = n, and arranging them such that all reds
Procedures as first-class objects In Python, unlike many other languages, methods are behave in much the same way as num bers: they can be stored as values of variable
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