Compiler compiler is a program that converts a program written in a programming language into a program in the native language, called machine language, of the machine that is to execute the program. You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). © O. Nierstrasz PS — Introduction 1.8 A formal language for describing computation? If you have facebook/gmail account them just Any of the above conditions can be waived if you get permission from the copyright holder. The basic rules for writing code in a specific programming language is called the syntax. Views : 1840 | Downloads : 0. O executing, causing the program to terminate (divide by zero, etc.) © O. Nierstrasz PS — Introduction 1.42 What you should know! uage termi o Syntax: The formal rules for legal statements in the language. The Basic Pattern Most of our programs will use the basic pattern of O Get some user input Perform some algorithm on the input Provide results as output, Identifiers are names of various program elements O in the code that uniquely identify the elements. 1 print "hello warld " hello world "hello world" Hello World ' hw.isdigit() False hw.islower() True 24 Col: 4 9, String Methods The string held in your variable remains the same O The method returns an altered string Changing the variable requires reassignment O hw hw . Inactive member won’t be able to 100500 DISPLAY "HELLO, WORLD." © O. Nierstrasz PS — Introduction 1.6 Schedule Introduction Stack-based programming Scheme (guest lecture) Functional programming Types and polymorphism Lambda calculus Fixed points Programming language semantics Objects and types Logic programming Applications of logic programming Visual programming Final exam, © O. Nierstrasz PS — Introduction 1.7 Roadmap Course Schedule Programming Paradigms A Quick Tour of Programming Language History, What is a Programming Language? No language design effort (made it up as they went along) Most effort spent on code generation and optimization FORTRAN I released April 1957; working by April 1958 The current standard is FORTRAN 2003(FORTRAN 2008 is work in progress), © O. Nierstrasz PS — Introduction 1.18 Fortran … Innovations Symbolic notation for subroutines and functions Assignments to variables of complex expressions DO loops Comments Input/output formats Machine-independence Successes Easy to learn; high level Promoted by IBM; addressed large user base (scientific computing), © O. Nierstrasz PS — Introduction 1.19 “Hello World” in FORTRAN All examples from the ACM "Hello World" project: www2.latech.edu/~acm/HelloWorld.shtml PROGRAM HELLO DO 10, I=1,10 PRINT *,'Hello World' 10 CONTINUE STOP END, © O. Nierstrasz PS — Introduction 1.20 ALGOL 60 History Committee of PL experts formed in 1955 to design universal, machine-independent, algorithmic language First version (ALGOL 58) never implemented; criticisms led to ALGOL 60 Innovations BNF (Backus-Naur Form) introduced to define syntax (led to syntax-directed compilers) First block-structured language; variables with local scope Structured control statements Recursive procedures Variable size arrays Successes Highly influenced design of other PLs but never displaced FORTRAN. — Louden. ) Files are iterable objects, like lists 23, Error Capture Check for type assignment errors, items not in a list, etc. If you continue browsing the site, you agree to the use of cookies on this website. Create your slidesfinder account and upload PowerPoint presentations for free, share on social media 6, Fxarvle Python Python Shell Fyt.han z. a. oa Window Layout Help Watcher Stop A local or global name could not be found. Looks like you’ve clipped this slide to already. "hella " hell' war Id O print "hello world" Prints hello world to standard out Open IDLE and try it out yourself Follow along using IDLE 15 Col: 4 7, More than just printing Python is an object oriented language Practically everything can be treated as an object o "hello world" is a string Strings, as objects, have methods that return the result of a function on the string, String Methods hw.title() hw.

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