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Iteration (Loop) partI. Thanachat Thanomkulabut. Consider the following program!. How to write “Hello, Kitty” 2000 times?. using System; Namespace SimPleExample { class SimPleC { static void Main() { Console.WriteLine(”Hello, Kitty”); Console.WriteLine(”Hello, Kitty”);

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Iteration (Loop) partI


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iteration loop parti

Iteration (Loop) partI

Thanachat Thanomkulabut

consider the following program
Consider the following program!

How to write “Hello, Kitty” 2000 times?

using System;

Namespace SimPleExample {

class SimPleC {

static void Main() {

Console.WriteLine(”Hello, Kitty”);

Console.WriteLine(”Hello, Kitty”);

Console.WriteLine(”Hello, Kitty”);

Console.WriteLine(”Hello, Kitty”);

Console.WriteLine(”Hello, Kitty”);

Console.WriteLine(”Hello, Kitty”);

Console.WriteLine(”Hello, Kitty”);

}

}

}

#Hello, Kitty 7 times

looping version
Looping Version

How to write “Hello, Kitty” 2000 times?

using System;

Namespace SimPleLoopExample {

class SimLoopPleC {

static void Main() {

int i;

i = 0;

while (i<7) {

Console.WriteLine(”Hello, Kitty”);

i++;

}

}

}

}

#Hello, Kitty 7 times

looping or iteration in c

Iteration

(repeat)

Looping or Iteration in C#

while

do…while

foreach

for

outline
Outline
  • while statements
  • Loop controlled
  • do...while
while statement
while statement

For Single Statement

while (condition)

statement;

while (condition) {

statement-1;

statement-2;

.

.

.

statement-N;

}

FALSE

Condition

TRUE

Statement

For Multiple Statements

while example
while...example

1. initialize value

How this program works?

N

static void Main() {

int N = 0;

while (N < 3)

{

Console.WriteLine(”Kitty-{0}”, N);

N++; }

}

3

1

2

0

3. finish condition

False

TRUE

Monitor

2. runner

Kitty-0

Kitty-1

Kitty-2

while example9
while...example

Monitor

Kitty-0

Kitty-0

How this program works?

1. initialize value

Kitty-0

N

static void Main() {

int N = 0;

while (N < 3)

Console.WriteLine(”Kitty-{0}”, N);

N++;

}

0

3. finish condition

TRUE

{

Loop infinite

}

2. runner

while example10
while...example

Monitor

SUM

N

Please input N:

5

static void Main() {

int N, SUM;

SUM = 0;

N = 0;

while (N >= 0) {

Console.Write(”Please input N: ”);

N = int.Parse(Console.ReadLine());

if (N>=0)

SUM = SUM+N;

}

Console.WriteLine(“SUM = {0}”, SUM);

}

5

0

-1

3

0

5

8

Please input N:

3

Please input N:

-1

1. initialize value

TRUE

SUM = 8

FALSE

3. finish condition

FALSE

TRUE

2. runner

while example11
while...example

static void Main()

{

int n,x,fact;

  Console.Write(“Enter value of n : “);

n = int.Parse(Console.ReadLine());

fact = n;

x = n-1;

while (x >= 1)

{

fact = fact*x;

x = x-1;

}

Console.WriteLine(“{0}! = {1}”,n,fact);

}

n

x

fact

4

4

0

3

2

1

*3

*2

*1

Monitor

1. initialize value

Enter value of n :

4

FALSE

TRUE

3. finish condition

4! = 24

2. runner

test i
Test I
  • Write the program which
  • Input : n (positive interger number)
  • Output : sumation of 1+2+3+...+n
test i13
Test I

static void Main()

{

}

int n

;

,x=1

;

,sum=0;

Console.Write(“Enter value of n : ”);

n = int.Parse(Console.ReadLine());

while(x<=n)

{

}

sum = sum+x;

x++;

Console.Write(“sum = {0}”,sum);

while statements
While Statements
  • Since the condition is checked before the execution of the loop body
  • While loop is also called a pre-conditional loop.
  • As long as the entry condition is still true, the while loop will be repeated
  • Zero loop will be executed if the entry condition is false at the beginning
  • while statements are conditional iteration statements which execute the loop body only if the entry condition is true
outline15
Outline
  • while statements
  • Loop controlled
  • do...while
counter controlled

N <= 5

N++;

Counter Controlled

Monitor

N

1

2

4

3

6

5

1

2

static void Main() {

int N;

N = 1;

while ( )

{

Console.WriteLine(”{0}”, N);

}

}

3

FALSE

4

TRUE

5

How to display even number 1 to J on screen?

counter controlled18

N <= J

N%2==0

N++;

Counter Controlled
  • Display only even number between 1 to J

static void Main() {

int N, J;

J = int.Parse(Console.ReadLine());

N = 1;

while ( ) {

if ( )

Console.WriteLine(”{0}”, N);

}

}

2

4

6

8

.

.

.

How to display odd number between 1 to J on screen?

sentinel controlled
Sentinel-Controlled

Monitor

SUM

N

Please input N:

5

static void Main() {

int N, SUM;

SUM = 0;

N = 0;

while (N >= 0) {

Console.Write(”Please input N: ”);

N = int.Parse(Console.ReadLine());

if (N>=0)

SUM = SUM+N;

}

Console.WriteLine(“SUM = {0}”, SUM);

}

0

5

0

5

3

-1

8

Please input N:

3

Please input N:

-1

TRUE

SUM = 8

FALSE

FALSE

TRUE

outline21
Outline
  • while statements
  • Loop controlled
  • do...while
do while statement

Statement3

Statement2

Statement1

do...while statement

do{

statement1;

statement2;

statement3;

}while (condition);

true

condition

false

do while example
do...while example

How this program works?

N

Monitor

0

1

2

3

0

static void Main() {

int N = 0;

do{

Console.WriteLine(N);

N++; }while (N < 3);

}

1

2

FALSE

TRUE

do while example25
do...while example

Input your password :

Kaset

How this program works?

Input your password :

bkk

input

static void Main() {

string input; do{

Console.Write("Input your password:");

input = Console.ReadLine();

}while(input != "ABCD");

Console.WriteLine("Password Correct");}

Input your password :

ABCD

bkk

Kaset

ABCD

Password Correct

TRUE

FALSE

do while example26
do...while example

How this partial code works?

Monitor

n

x

Input :

6

int n,x=1; Console.Write("Input:"); n = int.Parse(Console.ReadLine());

Console.WriteLine("Factor of {0} is",n);

do{

if(n%x==0)

Console.WriteLine(x);

x++;

}while(x<=n);

6

7

1

6

5

4

3

2

Factor of 6 is

1

2

3

FALSE

TRUE

6

TRUE

FALSE

test ii
Test II
  • Write the program
  • Input : n (negative interger number)
  • Output : sumation of (-1)+(-2)+(-3)+...+n
test ii28
Test II

static void Main()

{

}

int n

;

,x=-1

;

,sum=0;

Console.Write(“Enter value of n : ”);

n = int.Parse(Console.ReadLine());

do{

}while(x>=n);

sum = sum+x;

x--;

Console.Write(“sum = {0}”,sum);

do while statement29
Do..while Statement
  • The loop body of a do..while statement will be executed first before the exit condition is checked
  • Do..while loop is also called a post-conditional loop because the condition is checked after the loop body
  • Do..while statement is a conditional iteration statements
  • A do..while statement will execute at least once
do while vs while

Statement

Statement

Statement

Do..while vs. While

Do..while statement

While statement

false

condition

true

Statement

Statement

true

condition

Statement

false

while do while more example
while & do..while more example
  • This program will Reverse integer input
  • Example
    • input : 1502
    • output : 2051

static void Main()

{ int number, right_digit;

  Console.Write("Enter your number : ");

number = int.Parse(Console.ReadLine());

Console.Write("Reverse number is : ");

while (number != 0)

{ right_digit = number%10;

Console.Write("{0}",right_digit);

number = number/10;

}

}

while do while more example32
while & do..while more example

static void Main()

{ int n, count, k;

  Console.Write ("Please enter number of n : ");

n = int.Parse(Console.ReadLine());

k = 1; count = 1;

do{

Console.Write("{0} ",k);

k = k+2;

count = count+1;

}while (count<=n);

}

  • This program will show odd number n numbers
  • Example
    • input : 5
    • output : 1 3 5 7 9