Chapter 3 Control Statements FSelection Statements Using if

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Chapter 3 Control Statements FSelection Statements –Using if and if. . . else –Nested

Chapter 3 Control Statements FSelection Statements –Using if and if. . . else –Nested if Statements –Using switch Statements –Conditional Operator FRepetition Statements –Looping: while, do, and for –Nested loops –Using break and continue 1

Selection Statements F if Statements F switch Statements F Conditional Operators 2

Selection Statements F if Statements F switch Statements F Conditional Operators 2

if Statements if (boolean. Expression) { statement(s); } Example: if ((i >= 0) &&

if Statements if (boolean. Expression) { statement(s); } Example: if ((i >= 0) && (i <= 10)) { System. out. println("i is an “ + “integer between 0 and 10"); } 3

The if. . . else Statement if (boolean. Expression) { statement(s)-for-the-true-case; } else {

The if. . . else Statement if (boolean. Expression) { statement(s)-for-the-true-case; } else { statement(s)-for-the-false-case; } 4

if. . . else Example if (radius >= 0) { area = radius*PI; System.

if. . . else Example if (radius >= 0) { area = radius*PI; System. out. println("The area for the “ + “circle of radius " + radius + " is " + area); } else { System. out. println("Negative input"); } 5

Nested if Statements Example 3. 1 Using Nested if Statements This program reads in

Nested if Statements Example 3. 1 Using Nested if Statements This program reads in number of years and loan amount and computes the monthly payment and total payment. The interest rate is determined by number of years. Test. If. Else 6

Conditional Operator if (x > 0) y = 1 else y = -1; is

Conditional Operator if (x > 0) y = 1 else y = -1; is equivalent to y = (x > 0) ? 1 : -1; 7

switch Statements switch (year) { case 7: annual. Interest. Rate = 7. 25; break;

switch Statements switch (year) { case 7: annual. Interest. Rate = 7. 25; break; case 15: annual. Interest. Rate = 8. 50; break; case 30: annual. Interest. Rate = 9. 0; break; default: System. out. println( "Wrong number of years, enter 7, 15, or 30"); } 8

switch Statement Flow Chart 9

switch Statement Flow Chart 9

Repetitions F while F do Loops F for F Loops break and continue 10

Repetitions F while F do Loops F for F Loops break and continue 10

while Loop Flow Chart 11

while Loop Flow Chart 11

while Loops while (continue-condition) { // loop-body; } Example 3. 2: Using while Loops

while Loops while (continue-condition) { // loop-body; } Example 3. 2: Using while Loops Test. While. java Test. While 12

do Loops do { // Loop body; } while (continue-condition) 13

do Loops do { // Loop body; } while (continue-condition) 13

do Loop Flow Chart 14

do Loop Flow Chart 14

for Loops for (control-variable-initializer; continue-condition; adjustment-statement) { //loop body; } int i = 0;

for Loops for (control-variable-initializer; continue-condition; adjustment-statement) { //loop body; } int i = 0; while (i < 100) { System. out. println("Welcome to Java! ” + i); i++; } Example: int i; for (i = 0; i<100; i++) { System. out. println("Welcome to Java! ” + i); } 15

for Loop Flow Chart 16

for Loop Flow Chart 16

for Loop Examples for using the for loop: F Example 3. 3: Using for

for Loop Examples for using the for loop: F Example 3. 3: Using for Loops Test. Sum F Example 3. 4: Using Nested for Loops Test. Mul. Table 17

The break Keyword 18

The break Keyword 18

The continue Keyword 19

The continue Keyword 19

Using break and continue Examples for using the break and continue keywords: F Example

Using break and continue Examples for using the break and continue keywords: F Example 3. 5: Test. Break. java Test. Break F Example 3. 6: Test. Continue. java Test. Continue 20

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