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Engineering Computing I. Chapter 1 – Part B A Tutorial Introduction continued. Character Input and Output. c = getchar ();. reads the next input character from a text stream. Variable ‘c’. File Copying. File Copying Compact Form.

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engineering computing i

Engineering Computing I

Chapter 1 – Part B

A Tutorial Introduction continued

character input and output
Character Input and Output

c = getchar();

reads the next input character from a text stream

Variable ‘c’

Chapter 1 - Part B

file copying
File Copying

Chapter 1 - Part B

file copying compact form
File CopyingCompact Form

The parentheses around the assignment, within the condition are necessary!

c = getchar() != EOF

c = (getchar() != EOF)

Chapter 1 - Part B

exercises
Exercises

Exercise 1-6. Verify that the expression getchar() != EOF is 0 or 1

Exercise 1-7. Write a program to print the value of EOF

Chapter 1 - Part B

character counting
Character Counting

Auto-increment

Equivalent to:

nc = nc +1;

Chapter 1 - Part B

line counting
Line Counting

Chapter 1 - Part B

exercise
Exercise

Write a program named BlankCounting.c to count blanks.

Chapter 1 - Part B

word counting pseudo code
Word CountingPseudo Code
  • Initialize
    • State = OUT /* start assuming not within a word */
    • nc = nl = nw = 0 /* all counters are cleared*/
  • while (c= character) != EOF
  • {
    • ++nc
    • if c== \nl
      • ++nl
    • if c is a white character – i.e. ‘ ‘, ‘\n’ or ‘\t’
      • State = OUT /* start of the none white character will create a word */
    • else if State == OUT
      • State = IN
      • ++nw
  • }

This*is**a*test!

c

State

nl

nc

nw

Chapter 1 - Part B

word counting
Word Counting

Chapter 1 - Part B

1 6 arrays
1.6 Arrays

write a program to count the number of occurrences of each digit, of white space characters (blank, tab, newline), and of all other characters

Chapter 1 - Part B

exercise1
Exercise
  • Write a program to count the number of occurrences of all “vowels”, i.e. ‘a’, ‘e’, ‘i’ , ‘o’ and ‘u’. Use an array of counters.

Chapter 1 - Part B

slide13

A function provides a convenient way to encapsulate some computation, which can then be used without worrying about its implementation.

  • With properly designed functions, it is possible to ignore how a job is done; knowing what is done is sufficient.
  • functions like printf, getchar and putchar have been supplied by C Library
  • Write the function power(m,n) to raise an integer m to a positive integer power n. That is, the value of power(2,5) is 32

Chapter 1 - Part B

function power m n
function power(m,n)

A function definition has this form:

return-type function-name(parameter declarations, if any)

{

declarations

Statements

return expression;

}

Chapter 1 - Part B

how to call a function
How to Call a Function

Chapter 1 - Part B

1 9 character arrays
1.9 Character Arrays
  • The most common type of array in C is the array of characters
  • write a program that reads a set of text lines and prints the longest

Chapter 1 - Part B

how strings are stored
How Strings Are Stored!

"hello\n"

Chapter 1 - Part B

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