Programming for Engineers: Getting Started

Transcription

1 Programming for Engineers: Getting Started 10 January 2011

2 History of C: Timeline Ken Thompson working on UNIX Dennis Ritchie creates C ANSI C (C89) ISO C (C90) ANSI/ISO C Revision (C99)

3 Advangates and Disadvantages of C Advantages Efficiency Portability Power & Flexibility Programmer Oriented Disadvantages Allows use of pointers Code may be obscure a <<= 5;

4 Central Processing Unit (Execute C instructions) Random Access Memory, RAM (C instruction in memory in machine code) Input/Output (Read/write file, keyboard, monitor)

5 Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program 1. Define the program objectives 2. Design the program 3. Write the code 4. Compile 5. Run the program 6. Test and debug the program 7. Maintain and modify the program

6 Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program Define the Program Objectives Write a program that converts your age in years to day and displays both values At this point, dont worry about fractional years and leap years.

7 Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program Design the Program Initialize age in years Convert years to days Display age in years and days Prompt for keypress Wait for keypress Return to operating system

8 Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program #include <stdio.h> /* prototype for printf( ) */ #include <conio.h> /* prototype for kbhit( ) */ /* James E Grover */ /* 21 November 2007 */ int main(void){ int age; /* allocate space for age in years */ int days; /* allocate space for age in days */ age=60; /* initialize age */

9 Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program /* Program Continued */ days=age*365.25; /* calculate age in days */ printf( nmy age in years is %d.,age); printf( nmy age in days is %d.,days); while(!kbhit()); /* wait for keypress */ } return (0); /* return error level zero to OS */

10 Compile and Run Results Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program

11 Define the program objectives Design the program Write the code Compile, Run the Program, Test and Debug the Program Maintain and Modify the Program Improving the Program Prompt user for data at run time Read data from keyboard Chapter 2 Problem 3 Revised printf( Enter your age in years. < n ); scanf( %d,&age); days=age*365.25; printf( nyour age in years is %d.,age); printf( nyour age in days is %d.,days);

12 Turbo C Mechanics History of C Turbo C IDE Windows Integrated Development Enviornments

13 Turbo C IDE Windows Integrated Development Enviornments Windows Integrated Development Enviornments Microsoft Visual Studio Express Borland Developers Studio Pacific C Others

14 01 Print out a copy of Assignment 01 from the course website, and fill out the information sheet. Due Date: 14 January 2011 The course website is jla36/peng2011.htm