java programming - chapter 3 (in thai)

7/25/2019 Java Programming - Chapter 3 (in Thai)

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Computer Programming using JavaDecision Statements - 03

CHAPTER

3

123

45

1234567

8910

(Decision Statements)

1. (Basic Decision Statements)

1. 1)

(Condition)

2)

2 [1] i f - el se [2] swi t ch- casei f - el se

3)

2. 1 1 i f

1 [] n(5 )

ConditionTrue

False Statement

123

if( Condition) {Stat ement ;

}

(Condition) (Boolean Expression)i f

i f1 1

i fi f

i f ( scor e >= 100) {Syst em. out . pr i nt ( "A") ;

}

Syst em. out . pr i nt ( "B") ;Syst em. out . pr i nt ( "C") ;

scor e = 120 ABCscor e = 100 ABCscor e = 60 BC

i f ( n < 50)Syst em. out . pr i nt l n( "1"+n) ;

System. out . pr i nt l n( n++) ;i f ( n = 100) {System. out . pr i nt l n( n- - ) ;

System. out . pr i nt l n( - - n) ;}System. out . pr i nt l n( n++) ;

n = 49 n = 75 n = 60 n = 100 n = 123


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Computer Programming using Java 03 - Decision Statements

12345

123

456

2 [] if(15 )

1) x0x (5 )

2) i 10i1 (5 )

3)

gpa

2.00

"Pass"

"Retire" (5 )

3.

2 2 i f - el se

if( Condition) {Stat ement 1;

}else {Stat ement 2;

}

2 i fel se(else(Condition) )

i fel se1 1

i f ( scor e >= 100) {Syst em. out . pr i nt ( "A") ;

} el se {

Syst em. out . pr i nt ( "B") ;}Syst em. out . pr i nt ( "C") ;

ConditionTrueFalse

Statement1Statement2

i f - el sei fel se

i fi fel se

scor e = 120 AC

scor e = 100 ACscor e = 60 BC


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1234

567891011

123456789

3 [] s(5 )

4 [] if-elsen "is odd number"

"is even number" (5

)

4. 2 ()2 i f - el sei f - el se

i f ( s >= 40)Syst em. out . pr i nt l n( "1"+s) ;el se {

System. out . pr i nt l n( "0") ;

Syst em. out . pr i nt l n( ++s) ;}i f ( s >= 90)

Syst em. out . pr i nt l n( s++) ;el se

Syst em. out . pr i nt l n( ++s) ;System. out . pr i nt l n( - - s) ;

s = 39 s = 40 s = 89 s = 100 s = 0

if( Condition1) {Stat ement 1;

}else if( Condition2) {Stat ement 2;

}else if( Condition3) {...

}else{

St at ementN; }

i fel se i f el seel se(9)

()

i fi fel se i f el sei fel se()

Condition1TrueFalse

Statement1

Statement2

Condition2False True


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5 [] score(11 )

6 [] if-elseif-else num"Positive

Number" "Negative Number"

"Zero Number" (8 )

5. (Condition / Boolean Expression)

1) (Boolean) Tr ueFal sea == b, gr ade == ' A' , x < 4, y >= 10. 0, 1 == 1. 0

2) (Comparison Opera-tors) == ! = < > =

3)

(Logical Operators) && | | !

1234

567891011121314151617

181920212223

i f ( scor e > 100) {System. out . pr i nt l n( "Er r or 1") ;

} el se i f ( scor e < 0) {System. out . pr i nt l n( "Er r or 2") ;

} el se i f ( score == 0) {System. out . pr i nt l n( "Er r or 3") ;} el se i f ( score >= 80) {

System. out . pr i nt l n( "A") ;} el se i f ( score >= 75) {

Syst em. out . pr i nt l n( "B+") ;} el se i f ( score >= 70) {

System. out . pr i nt l n( "B") ;} el se i f ( score >= 65) {

Syst em. out . pr i nt l n( "C+") ;} el se i f ( score >= 60) {

Syst em. out . pr i nt l n( "C") ;} el se i f ( score >= 55) {

Syst em. out . pr i nt l n( "D+") ;} el se i f ( score >= 50) {Syst em. out . pr i nt l n( "D") ;

} el se {System. out . pr i nt l n( "F") ;

}

score

1. 90

2. - 3

3. 47

4. 55

5. 64

6. 79

7. 0

8. 101

9. 71

10. 50

11. 66


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1234

12345

678

{i nt a = 1;{ i nt b = 2; }{ a = 3; }

b = 4; //Error

i nt c = a;c = c + 1;

}

4)

5)

=== n = 1n == 1n = 1n1n == 1n1

7 [] (T) (F) (15 ) (T/F) 1. ( 2 < 5) && ( 6 != 7) | | ( 3 > 4) -

2. ( x > 13) | | ( x


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123456

i nt x = 5;i f ( x < 10) {

i nt y = x;}System. out . pr i nt l n( x) ;System.out.println(y); //Error

2) if-else(1)

i f el se i f el sei fel se

(2)

i fel se i fel sei fel se

8 [] () ()(6 )1) i nt y = 25;

i f ( y > 30) {System. out . pr i nt l n( y) ;

}

2)

i nt y;i f ( y 50) {

y = ++x;}

i f ( x < 50) {y = - - x;

}System. out . pr i nt l n( y) ;

yi fi fi f


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1 2 3 4

1 2 3 4

9 [] n (Absolute) n Math(10 )

10 [] - a b

(ifelse)

(10 )


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1 2 3 4

11 [] (NoobLevels) 1 (Noob) 2 (Father Noob) 3(God Noob) 4 (Hof Noob)

"13 006 2526""1 12 2535""04 08 2537" (10 )

12 [] 3 3 r1,r2r3type1 2

"Incorrect Circuit Type" rTotal(10 )

1)4)%yearmonthday((NoobLevel +++=


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1 2 3 4

( if else ifelse)

13 [ ] 10 "Invalid ID"1. 2 21

"Engineering Student" "Unknown Student"

2. (Undergraduate)

(Graduate) 3 3 "Undergraduate" 7"Graduate""Unknown Levels"

321total R

1

R

1

R

1

R

1++= 321total RRRR ++=


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1 2 3 4 5 6

3. 2 1 "Freshmen" 2 "Sophomore" 3 "Junior" 4 "Senior"

(15 ) St udent I D : 5330123421Engi neer i ng St udentUndergraduat e1 ( Fr eshmen)

St udent I D : 5271822821Engi neer i ng St udentGr aduat e2

java programming - chapter 3 (in thai)

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