selection statement thanachat thanomkulabut. outline 2 boolean expression if if statement nested...
TRANSCRIPT
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Selection StatementThanachat Thanomkulabut
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Outline2
Boolean expression ifif statement nested if nested if statement switch case switch case statement Flowchart
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Boolean Expression
Operators Comparison
Equal ==== Not equal !=!= Less << Greater >> Less than or equal to <=<= Greater than or equal to >=>=
Boolean And &&&& Or |||| Not !!
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Boolean Expression
0 and 0 = 00 and 1 = 01 and 0 = 01 and 1 = 1
0 or 0 = 00 or 1 = 11 or 0 = 11 or 1 = 1
not 0 = 1not 1 = 0
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Boolean Expression Example
From the equation: X2+9X+10 = 0 How can we check that value of X is the
answer for above equation?
Condition: Is value Y even number?
((X*X +9*X +10) == 0) //true if X is the //true if X is the answeranswer
(Y%2 == 0) //true if Y is even//true if Y is even
OROR
(Y%2 != 1) //true if Y is even//true if Y is even
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Boolean Expression
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Example: Boolean Expressions
double x = 4.0; Expression Value
x < 5.0 ___________x > 5.0 ___________x <= 5.0 ___________5.0 == x ___________x != 5.0 ___________(3!=4)&&(7<5) ___________(4>4)||(5<=10) ___________
truefalsetruefalsetrue
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Boolean Expression
falsetrue
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Outline6
Boolean expression ifif statement nested if nested if statement switch case switch case statement Flowchart
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if statement
Execute the specific statement when the ”condition””condition” becomes truetrue
Syntax:
if if (condition)(condition)
statement; statement;
if if (condition) (condition) {{
statement1; statement1;
statement2; statement2;
}}if if (condition)(condition) {{
statement; statement;
}}
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if statement
truetrue
truetrue
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if statement8
conditionFalse
True
Statement
if if (condition)(condition)
statement; statement;
if if (condition)(condition) {{
statement; statement;
}}
if statement
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if statement9
condition
FalseTrue
Statement1
Statement2
if if (condition)(condition) {{
statement1; statement1;
statement2; statement2;
}}
if statement
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if statement
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if statement example BMI (Body Mass Index)
BMI Weight Status
Below 18.5 Underweight
18.5 – 24.9 Normal
25.0 – 29.9 Overweight
30.0 and Above Obese (Extremely Fat)
BMI =Weight in KilogramsWeight in Kilograms
(Height in Meters) X (Height in Meters)(Height in Meters) X (Height in Meters)
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if statement
BMI Weight Status
Below 18.5 Underweight
18.5 – 24.9 Normal
25.0 – 29.9 Overweight
30.0 and Above Obese (Extremely Fat)
BMI =Weight in KilogramsWeight in Kilograms
(Height in Meters) X (Height in Meters)(Height in Meters) X (Height in Meters)
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double BMI = W /(H*H);double BMI = W /(H*H);
if(BMI<18.5)if(BMI<18.5) Console.WriteLine(“Underweight”);Console.WriteLine(“Underweight”);
if(BMI>=18.5 && BMI<=24.9)if(BMI>=18.5 && BMI<=24.9) Console.WriteLine(“Normal”);Console.WriteLine(“Normal”);
if(BMI>=25.0 && BMI<=29.9)if(BMI>=25.0 && BMI<=29.9) Console.WriteLine(“Overweight”);Console.WriteLine(“Overweight”);
if statement example
if(BMI>=30.0)if(BMI>=30.0) Console.WriteLine(“Obese”);Console.WriteLine(“Obese”);
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if statement
Test I
Selfish Ratio
Ratio Output
More than 1 You are selfish
1 You break even
Less than 1 You are giver
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Selfish Ratio =RecievingRecieving
GivingGiving
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if…else… statement
If conditioncondition is truetrue execute statement1statement1 If conditioncondition is falsefalse execute statement2statement2 Syntax:if if (condition)(condition)
statement1; statement1; //true//true
elseelse
statement2; statement2; ////falsefalse
if if (condition)(condition)
statement1; statement1; //true//true
elseelse { {
statement2; statement2; ////falsefalse
statement3; statement3; ////falsefalse
}}
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if statement
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if…else… statement14
conditionFalseTrue
Statement2Statement1
if if (condition)(condition)
statement1; statement1; //true//true
elseelse
statement2; statement2; ////falsefalse
if statement
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if…else… statement15
if if (condition)(condition)
statement1; statement1; //true//true
elseelse { {
statement2; statement2; ////falsefalse
statement3; statement3; ////falsefalse
}}
conditionFalseTrue
Statement2
Statement1
Statement3
if statement
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if…else… statement example
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Write the program which check input number. input : integer number output : message to inform that number is
odd or even.
Value in N Output
Even Number It’s even number.
Odd Number It’s odd number.
if statement
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if…else… statement example
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Value in N OutputEven Number It’s even number.
Odd Number It’s odd number.
if statement
if(n%2 == 0)if(n%2 == 0)
Console.WriteLine(“It’s even number”);Console.WriteLine(“It’s even number”);
elseelse
Console.WriteLine(“It’s odd number”);Console.WriteLine(“It’s odd number”);
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Test II18
Write the program which find the value of function input : number output :
f(x) x
x2+1 x<0
x+2 x≥0
if statement
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Outline19
Boolean expression ifif statement nested if nested if statement switch case switch case statement FlowChart
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Nested if statement
int N;int N;N = int.Parse(Console.ReadLine());N = int.Parse(Console.ReadLine());
if (N >= 0) if (N >= 0) {{ if (N==0)if (N==0) Console.WriteLine(“N is zero Console.WriteLine(“N is zero number”);number”); elseelse Console.WriteLine(“N is positive Console.WriteLine(“N is positive number”); number”); }}else else Console.WriteLine(“N is negative Console.WriteLine(“N is negative number”);number”);
if#1if#1
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Nested if statement
if#2if#2
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Nested if statement
int N;int N;N = int.Parse(Console.ReadLine());N = int.Parse(Console.ReadLine());
if (N > 0) if (N > 0) Console.WriteLine(“N is positive Console.WriteLine(“N is positive number”); number”);
elseelse if (N==0)if (N==0) Console.WriteLine(“N is zero Console.WriteLine(“N is zero number”);number”); elseelse Console.WriteLine(“N is negative Console.WriteLine(“N is negative number”);number”);
if#1if#1if#2if#2
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Nested if statement
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Nested if statement
int N;int N;N = int.Parse(Console.ReadLine());N = int.Parse(Console.ReadLine());
if (N >= 0) if (N >= 0) {{ if (N==0)if (N==0) Console.WriteLine(“N is zero Console.WriteLine(“N is zero number”);number”); elseelse Console.WriteLine(“N is positive Console.WriteLine(“N is positive number”); number”); }}else else Console.WriteLine(“N is negative Console.WriteLine(“N is negative number”);number”);
-5
-5 >= 0 False
N is negative number
N
-5
0
0
0 >= 0 TrueTrue
N is zero number
3
3
3 >= 0
False
N is positive number
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Nested if statement
Nested if statement
int N;int N;N = int.Parse(Console.ReadLine());N = int.Parse(Console.ReadLine());
if (N > 0) if (N > 0) Console.WriteLine(“N is positive Console.WriteLine(“N is positive number”); number”);
elseelse if (N==0)if (N==0) Console.WriteLine(“N is zero Console.WriteLine(“N is zero number”);number”); elseelse Console.WriteLine(“N is negative Console.WriteLine(“N is negative number”);number”);
N
-4
-4
-4 > 0 FalseFalse
FalseFalse
N is negative number
0
0
0 > 0
TrueTrue
N is zero number
3
3
3 > 0 TrueTrue
N is positive number
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Exercise 1: Separated IF (simple)
if (eaten==true) {Console.WriteLine(“ I’ve already eaten”);}else {Console.WriteLine(“ I’ve not eat yet”);}if (like_noodle==true) {Console.WriteLine(“I like noodle”);}else {Console.WriteLine(“I don’t like noodle”);}
1. Have you eaten lunch?2. Do you like noodle?
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if (like_noodle==true) {Console.WriteLine(“I like noodle”);}else { Console.WriteLine(“I don’t like noodle”); if (like_friedrice==true) {Console.WriteLine(“I like friedrice”);} else {Console.WriteLine(“I don’t like friedrice”);} }
1. Do you like noodle? 2. If you don’t like noodle, do you like fried rice?
Exercise 2: Related two IF (full version)25
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if (like_noodle==true) {Console.WriteLine(“I like noodle”);}else if (like_friedrice==true) {Console.WriteLine(“I like friedrice”);}else {Console.WriteLine(“I don’t like friedrice”);}
1. Do you like noodle? 2. If you don’t like noodle, do you like fried rice?
Exercise 2: Related two IF (short version)26
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if (like_noodle==true) {Console.WriteLine(“I like noodle”);
if (love_SenYai==true) {Console.WriteLine(“I love Sen-Yai”);}
else{Console.WriteLine(“I don’t love Sen-Yai”);}
}else if (like_friedrice==true) {Console.WriteLine(“I like fried rice”);}else {Console.WriteLine(“I don’t like fried rice”);}
1. Do you like noodle? 1.1 If you like noodle, do you love Sen-Yai? 1.2 If you don’t like noodle, do you like fried rice?
Exercise 3: Nested two IF (short version)27
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Nested if statement example28
Write the program which show student’s grade input : score of student output :
Score Grade
80 – 100 A
70 – 79 B
60 – 69 C
50 – 59 D
0 – 49 F
Nested if statement
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Test III29
Write the program which calculation value of following function input : value of x output : function value of x according
with ...
Nested if statement
f(x) =f(x) =2x+10, x ≤ 52x+10, x ≤ 5
xx22+10, 5 < x ≤ 20+10, 5 < x ≤ 20xx33+10, x > 20+10, x > 20
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Outline30
Boolean expression ifif statement nested if nested if statement switch case switch case statement Flowchart
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switch…case statement
For selecting a statement where its label corresponds to the value of the switch expression.
switch (<expression><expression>){ case <constant-expression> <constant-expression> : <statements>;<statements>; break;break;
[default: <statements>;<statements>; break;break;]}
<expression><expression> must be int, must be int, char, stringchar, string
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switch...case statement
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Example: switch-case (1)
int day_num;
day name
1 Sunday
2 Monday
3 Tuesday
4 Wednesday
5 Thursday
6 Friday
7 Saturday
int day_num;
Console.Write("Input the day"); day_num = int.Parse(Console.ReadLine());
switch(day_numday_num) {case 1:1: Console.Write ("Today is Sunday"); break;
case 2:2: Console.Write("Today is Monday"); break; : default :: Console.Write ("I don’t know"); break;}
<expression><expression>
<constant-expression><constant-expression>
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switch...case statement
1230
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Test III33
Write the program which show numbers of day in each months input : Abbreviation of months output : numbers of day in each months
Input Output
Jan 31
Feb 28 or 29
Mar 31
Api 30
May 31
... ...
switch...case statement
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Example: switch-case (2)string month;
Console.Write("Input Month"); month = Console.ReadLine();
switch(monthmonth) {case “Jan”:“Jan”: case “Mar”:“Mar”: case “May”:“May”: Console.Write("This month has 31days"); break; case “Apr”:“Apr”: case “Jun”:“Jun”: Console.Write("This month has 30days"); break; default :: Console.Write (“Wrong Input"); break;}
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switch...case statement
Input Output
Jan 31
Feb 28 or 29
Mar 31
Api 30
May 31
... ...
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Example: switch-case (3)
char op;Console.Write("Select + - / * :");op=char.Parse(Console.ReadLine());
switch(op){ case '+': Console.Write("{0}+{1}={2}", x,y,x+y); break; case '-': Console.Write("{0}-{1}={2}", x,y,x-y); break; : default: Console.Write("Try again"); break;}
<expression><expression> must be must be int, char, stringint, char, string
int day_num; day_num=int.Parse(Console.ReadLine());
switch(day_num ) { case 1: Console.Write ("Sunday"); break;
case 2: console.Write("Monday"); break; : default : Console.Write(“Try again"); break;}
<expression><expression>
int versionint versionchar versionchar version
<constant-expression><constant-expression>
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switch...case statement
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Example: switch-case (4)
string op;Console.Write("Select + - / * :");op=Console.ReadLine();
switch(op){ case “+”: Console.Write("{0}+{1}={2}", x,y,x+y); break; case “-”: Console.Write("{0}-{1}={2}", x,y,x-y); break; : default: Console.Write("Try again"); break;}
<expression><expression> must be must be int, char, stringint, char, string
string versionstring version
<expression><expression>
<constant-expression><constant-expression>
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switch...case statement
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Convert switch-case to if else
int a;a=int.Parse(Console.ReadLine());
switch (a) { case 1 : case 2 : Console.WriteLine("Hi"); break; case 3 : case 4 : Console.WriteLine("Hello"); break; default : Console.WriteLine("Bye"); break;}
switch version with defaultswitch version with default
if (a == 1 || a == 2) Console.WriteLine("Hi");
else if (a == 3 || a == 4) Console.WriteLine("Hello");
else Console.WriteLine("Bye");
if else versionif else version
switch (a) { case 1 : case 2 : Console.WriteLine("Hi"); break;}
switch version without defaultswitch version without default
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switch...case statement
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Outline38
Boolean expression ifif statement nested if nested if statement switch case switch case statement Flowchart
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Flowchart Symbols Overview
Graphical representation
Terminator
Process
Input/output
Condition
Connector
Flow line
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Flowchart
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Program Flowchart Example
StartStart
Statement1Statement1
Statement2Statement2
Statement3Statement3
Statement4Statement4
EndEnd
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Flowchart
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if statement flowchartstatement1;statement1;
if if (condition)(condition)
statement2; statement2; ////truetrue
elseelse { {
statement3; statement3; ////falsefalse
}}
statement4; statement4;
StartStart
Statement1Statement1
ConditionCondition
Statement2Statement2 Statement3Statement3
truetrue falsfalsee
Statement4Statement4
EndEnd
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Flowchart
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if statement flowchart42n= n= int.Parse(Console.Reaint.Parse(Console.ReadLine());dLine());
if if (n>0)(n>0)
n= 2*n+5; n= 2*n+5;
elseelse { {
Console.Write(“Go”);Console.Write(“Go”);
n = n%4;n = n%4;
}}
StartStart
n>0n>0
n=2*n+5;n=2*n+5;
truetrue falsefalse
n=n%4;n=n%4;
EndEnd
n=int.Parse(Console.ReadLine());
Console.Write(“Go”);
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Test IV43
Write flow chart which accord to following programn= n=
int.Parse(Console.ReadLine());int.Parse(Console.ReadLine());
n = n%5;n = n%5;
if if (n==2)(n==2)
Console.WriteLine(“Remainder Console.WriteLine(“Remainder is 2”);is 2”);
elseelse { {
n = n*10;n = n*10;
}}
Console.WriteLine(“Program Console.WriteLine(“Program End”);End”);
![Page 44: Selection Statement Thanachat Thanomkulabut. Outline 2 Boolean expression if if statement nested if nested if statement switch case switch](https://reader035.vdocuments.mx/reader035/viewer/2022062322/5697bf7a1a28abf838c82f0b/html5/thumbnails/44.jpg)
Any question?