2 C Program Workshop

8/13/2019 2 C Program Workshop

1/13

THE C PROGRAMWORKSHOP


2/13


3/13

A computer program written in C

is like a workshop

It brings data into the program from the outside world, performs some processing with it, makes some changes to it,and then returns it to the outside world in a different form

main

Current Data

(Information)

Transformed Data

(Information)


4/13

C Program Entrances and Exits

STANDARD

OUT (stdout)

STANDARDIN (stdin)

STANDARDERROR (stderr)

Constants and variables

Operations and

functions

main

X Y Z

A B C D

Instructions and

operating procedures

File and Device

Input/Output


5/13

Data Types

Integers ( int ) Numbers with decimal points ( float ) Characters ( char ) Words and Phrases (ex. char phrase[10] ) Tables (ex. int values[10] , float matrix[20][30] ) Records (ex. struct myRecordType )


6/13

Data Storage Locations

int aNumber;

float aValue;

char aSymbol;

char phrase[LENGTH];

int values[15];


7/13

Simple Operations

Storage ( =) Addition ( +) Subtraction ( - ) Multiplication ( * ) Division ( / )

Modulo ( %) Comparison ( ==, != , < , , >=)


8/13

Instructions and Decisions

variableLocation = expression Ex. count = 17 * MAX_LOOPS;

if (Boolean condition) statement else statement Ex. if (numberIsValid)

count++;elsecount--;

while (Boolean condition) statement Ex. while (count > MAX_LOOPS)

count = count 5; for (statement; condition; statement) statement

Ex. for (i = 0; i < size; i++) printf(%d \ n, table[i]);


9/13

Technical Vocabulary:

C Keywords

auto double int struct

break else long switchcase enum register typedefchar extern return unionconst float short unsignedcontinue for signed voiddefault goto sizeof volatiledo if static while

(Note: Keywords in bold-face font are used with data types)


10/13

Standard C Library Functions

Standard Input and Output: printf, scanf, getchar, gets

Conversion of Data: isalpha, isdigit, tolower, toupper

Math: sin, cos, tan, sqrt, log, exp

Working with Files: fopen, fclose, fscanf, fprintf, fgets


11/13


12/13

Example Program Output

Ck Nbr Acct Tax Amount Balance------ ---- --- ------ -------

234 A Z 34.56 2356.96


13/13

Example Program Exercise

Using the current pattern of statements in the program,add the source code to display the last two lines of thereport shown below

Also, change the order of the report columns

Ck Nbr Amount Acct Balance Tax------ ------ ---- ------- ---

234 34.56 B 2356.96 Z235 192.73 T 2164.23 W236 75.00 G 2089.23 X

Documents

2 C Program Workshop