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CS 101 Problem Solving and Structured Programming in C

CS 101 Problem Solving and Structured Programming in C. Sami Rollins srollins@mtholyoke.edu Spring 2003. Introduction. What is computer programming? What is this class about? Who should take this class?. Administrative Information. Class web page

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CS 101 Problem Solving and Structured Programming in C

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  1. CS 101Problem Solving and Structured Programming in C Sami Rollins srollins@mtholyoke.edu Spring 2003

  2. Introduction • What is computer programming? • What is this class about? • Who should take this class?

  3. Administrative Information • Class web page http://www.mtholyoke.edu/courses/srollins/cs101/

  4. Assignments • Reading – Chapter 1 • Homework 0 – due Monday

  5. Computer Hardware • Main memory • Secondary memory • CPU • Input devices • Output devices

  6. Computer Software • Operating system • Examples? • Applications • Examples? • How is a new application developed?

  7. Computer Programs • At the lowest level – machine instructions • 00000111000 • One step up – assembly language • ADD A • More user friendly – high level languages • C = A + B; • Examples?

  8. Translation • High level language must be translated into a language the computer can understand High-level Code Compiler Machine Instructions

  9. Writing Programs • Understand requirements • Write an algorithm • Implement your algorithm • Test your code

  10. What is an algorithm? • A specific set of instructions • An algorithm to make a PBJ sandwich?

  11. Hello World /* * Name: Sami Rollins * Source file name: hello.c * My first "hello, world" program in C. */ #include <stdio.h> //the main function int main (void) { //print the phrase printf("Hello, world!"); return(0); }

  12. Errors • You WILL have errors in your programs • Syntax Errors • Compiler doesn’t understand code • Ex. – printf(Hello, world!”); • Sometimes error messages don’t match problem • Logic • Program runs, but doesn’t do what you want • Ex. – printf(“Hell, world!”); • Can be hard to track down

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