James Tam Creating Actual Computer Programs This section of notes describes how a computer program written by a person is translated to a form that can.

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Presentation transcript:

James Tam Creating Actual Computer Programs This section of notes describes how a computer program written by a person is translated to a form that can be understood by a computer. Also you learn about the basic structure of Pascal programs.

James Tam Creating Computer Programs: What You Know Specify the algorithm (pseudo-code and Flowcharts)

James Tam Creating Computer Programs: What You Will Learn Specify the algorithm (e.g., pseudo-code And Flowcharts) Write the program in a programming language e.g., Pascal, Basic, C++, Java etc. Translated by programmer

James Tam Creating Computer Programs: What You Will Learn (2) Specify the algorithm (e.g., pseudo-code And Flowcharts) Write the program in a programming language e.g., Pascal, Basic, C++, Java etc. Translated by a computer program (translator) Produce a Machine-understandable Program i.e., machine language

James Tam Translators Convert computer programs to machine language Types 1)Interpreters 2)Compilers

James Tam Compiling Programs On The CPSC Network: Basic View anything.p Pascal program a.out Machine language program gpc Pascal compiler

James Tam Compiling Programs On Different Operating Systems Pascal program Solaris compiler a.out (Solaris) Windows compiler a.out (Windows) AmigaDOS compiler a.out (AmigaDOS)

James Tam Components Of Computer Programs Headers Program name, version number, date last modified, what program does One form of documentation – comments for the reader of the program (not the computer): (*Marks the beginning of the documentation *)Marks the end of the documentation Declarations List of variables Statements The instructions in the program that actually gets stuff done Each statement is separated by a semicolon ";" Reminder: The filename for Pascal program must end with dot-p, ".p".

James Tam The Smallest Pascal Program (* The smallest compilable Pascal program written by James Tam *) program smallest begin end. Note: The name "smallest" should match the filename "smallest.p". You can find an online version of this program in the Unix file system under /home/231/examples/intro/smallest.p

James Tam Summary How is a computer program translated into a machine- understandable form What is the basic structure of a Pascal program What are the fundamental parts of Pascal programs