Introduction to compilation process

March 24

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The following slides will show you step by step instruction how to get ready and build C language programs in Linux Ubuntu.

1. Enter terminal by pressing <ctrl> <alt> t

2. To create a folder workspace/programming in you home folder type

mkdir -p ~/workspace/programming/3. Enter newly created folder cd ~/workspace/programming/

4. Enter text editor by typingnano first.c

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nano editor

See the control option at the bottom of the screen.For example to delete line of text press <ctrl> k

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Type your programImportant!!!

Add comments

Add indents

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Building the program To build(create a binary file) your program typegcc <source_file.c> -o <binary_file>

buildexecute

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Errors

Remove ;

Remove &

Lets make an error and a warning on purpose

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Building a program with errors

Notifies us about the syntactical error

Notifies us about the warning

Even thought program compiles and ready to run, it will not function correctly, thus pay attention to warnings carefully.

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Largest of three numbers

start

read X, Y, Z

stop

X > Y ?

stop

yes no

max > Z ?

Output max Output z

yes no

Max = X Max = Y

Transform the flowchart below to a C language program.

See next slide

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Largest of three numbers

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Find whether a number is odd or even Draw a flow chart for the algorithm that checks whether the

number is odd or even. Convert the algorithm into C language program

start

read x

stop

x % 2 == 0 ?

stop

yes no

Output “even”

Output “odd”

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Find whether a number is odd or even Type the program in nano editor and compile it with

gcc evenodd.c -o evenodd

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Example of a while loop The program prints out a conversion table from Fahrenheit to

Celsius. Draw a corresponding flowchartProgram Output

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start

read N

stop

Count > N ?

output sum

no yes

sum = sum + count * count

sum = 0count = 1

count = count + 1

Example of a for loopThe program calculates the following sum: sum = 12 + 22 + 32 + … + N2

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The following slides are your homework assignments

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start

read N

stop

Count > N ?

output sum

no yes

sum = sum + count * (count + 1)

sum = 0count = 1

count = count + 1

Problem 1

Convert to C program

Use do{}while() loop construction

sum = 1*2 + 2*3 + 3*4 + … + N*(N +1)

The following algorithm calculates the sum

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start

read N

stop

count > N ?

output sum

no yes

prod = prod * count

prod = 1count = 1

count = count + 1

Problem 2

Convert to C program

Use for() loop construction

The following algorithm calculates factorial

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start

Read X, N

stop

count > N ?

output sum

noyes

sum = prod * countterm = term * X / count

term = 1prod = 1count = 1

count = count + 1

Problem 3

Use Taylor expansion to represent ex up to N terms.

Convert to C program

Hint: Use for() loop construction

The following algorithm computes ex series up to N terms

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start

Read X, N

stop

term < .0001 ?

output sum

noyes

sum = prod * countterm = term * X / count

term = 1prod = 1count = 1

count = count + 1

Problem 4

Use Taylor expansion to represent ex up to 4 decimal places.

Convert to C program

Hint: Use do{}while() loop construction

The following algorithm computes ex series up to 4 decimal places