Chapter 5 Program Control Statement (1)

IFELSE.JAVA

// DemonStrate if-else-if statements.public class ifelse {public static void main (string [] args) {int MONTH = 4; // April string season; if (Month == 12 || Month == 1 || Month == 2) Season = "winter"; else if (Month == 3 || Month == 4 || Month == 5) Season = "Spring"; else if (Month == 6 || Month == 7 || Month == 8) Season = "Summer"; Else IF (Month == 9 || Month == 10 || Month == 11) Season = "autumn"; else season = "bogus month"; system.out .println ("April Is in the" Season ".");}}

Sampleswitch.java

// a Simple Sample of the Switch.public Class Sampleswitch {Public Static Void Main (String [] args) {for (int i = 0; i <6; i ) switch (i) {cas 0: system.out.println ("i is zero."); Break; Case 1: System.out.println ("i is one."); Break; Case 2: System.out.println ("i is two."); break; casse 3: System.out.println ("i is three."); Break; default: system.out.println ("i is greater ten.");}}}

MissingBreak.java

// in A SiWTCH, Break Statements Are Optional.public Class missingbreak {public static void main (string [] args) {for (int i = 0; i <12; i ) Switch (i) {case 0: Case 1: Case 2: Case 3: Case 4: System.Out.println ("i is Less Than 5"); Break; Case 5: Case 6: Case 7: Case 8: Case 9: System.out.println ("i IS Less Than 10 "); Break; default: system.out.println (" i is 10 or more ");}}} switch.java

// An improved version of the season {public static void main (string [] args) {int MONTH = 4; String Season; switch (Month) {Case 12: Case 1: Case 2: Season = " Winter "; break; case 3: case 4: case 5: Season =" Spring "; break; cas 6: case 7: case 8: season =" summer "; break; case 9: case 10: case 11: season = "Autumn"; break; default: season = "bogus month";} system.out.println ("April is in the" ".");}}

While.java

// DemonStrate the while loop.public class while {public static void main (string [] args) {int n = 10; while (n> 0) {system.out.println ("tick" n); N-- }}}

NoBody.java

// the target of a loop can be equpty.public class number {public static void main (string [] args) {INT i, j; i = 100; j = 200; // Find Midpoint Between i and j while ( i <--j); // no body in the loop system.out.println ("MidPoint IS" i);}} Dowhile.java

// demonstrate the do-while loop.public class downhile {public static void main (string [] args) {int n = 10; do {system.out.println ("tick" n); n--;} while (n> 0);}}

Menu.java

// using a do-while to process a menu selectionpublic class menu {public static void main (string [] args) throws java.io iexception {char choice; do {system.out.println ("Help on:"); System.out.println ("1. IF"); System.out.Println ("2. Switch"); System.out.Println ("3. While"); System.out.println ("4. Do- "); system.out.println (" 5. for / n "); system.out.println (" choise one: "); choice = (char) system.in.read ();} while (choice < '1' || Choice> '5'); system.out.println ("/ n"); switch (choice) {case '1': system.out.println ("the if: / n"); system .out.println ("if (condition) statement;"); system.out.println ("else statement;"); Break; Case '2': system.out.println ("the switch: / n"); System.out.println ("Switch (Expression) {"); System.out.Println ("Case Constant:"); System.out.println ("Statement Sequence"); System.out.println ("Break;"); System.out.Println ("// ..."); system.out.println ("}"); Break; Case '3': System.out.Println ("the while: / n"); system.out.println ("while (condition) statement;"); Break; Case '4': system.out.println ("THE do-while: / n"); system.out.println ("do {"); system.out.println ("statement;");

System.out.println ("} while (condition);"); break; case '5': system.out.println ("THE for: / n"); system.out.println ("for; condition ortho; "); system.out.println (" statement; "); break;}}} fortick.java

// DemonStrate the for loop.public class fortick {public static void main (string [] args) {int N; for (n = 10; n> 0; n--) system.out.println ("tick" n }}

Formk.java

// Declare a loop control variable inside the for.public class fortick {public static void main (string [] args) {// here, n is declared inside of the for loop for (int N = 10; n> 0; n -) System.out.println ("Tick" N);}}

FINDPRIME.JAVA

// Test for primes.public class findprime {public static void main (string [] args) {Int num; boolean isprime = true; Num = 14; for (int i = 2; i <= Num / 2; i ) { IF ((NUM% I) == 0) {isprime = false; break;}} if (isprime) System.Println ("prime"); else system.out.println ("not prime");}}