Java if else condition - powerpoint persentation
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The document discusses the if-else conditional statement in Java. It provides 11 examples of using if-else statements to evaluate boolean conditions and execute code blocks accordingly. The if-else statement allows programmers to control program flow based on conditional logic. Key aspects covered include syntax, comparing values, else-if blocks, nesting if statements, and printing outputs before and after the conditional block.
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import java.util.Scanner;public class Main {private static i.pdf
import java.util.Scanner;public class Main {private static i.pdfstopgolook import java.util.Scanner;
public class Main {
private static int n;
private static int[] referenceString;
private static int[] physicalFrames;
private static int[] victimPages;
private static int pageFaults;
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int choice;
do {
System.out.println("0 Exit");
System.out.println("1 Input N");
System.out.println("2 Input the reference string");
System.out.println("3 Simulate the OPT algorithm");
System.out.println("4 Simulate the NEW algorithm");
System.out.print("Select option: ");
choice = input.nextInt();
switch (choice) {
case 0:
System.out.println("Exiting the program...");
break;
case 1:
System.out.print("Enter the value of N (2-8): ");
n = input.nextInt();
if (n < 2 || n > 8) {
System.out.println("Invalid value of N!");
n = 0;
} else {
physicalFrames = new int[n];
victimPages = new int[n];
System.out.println("N set to " + n + ".");
}
break;
case 2:
if (n == 0) {
System.out.println("Please enter the value of N first!");
} else {
System.out.print("Enter the reference string (length at least " + n + ", max length 20): ");
String[] strArr = input.next().split("");
int len = strArr.length;
if (len < n || len > 20) {
System.out.println("Invalid length of reference string!");
} else {
referenceString = new int[len];
for (int i = 0; i < len; i++) {
int page = Integer.parseInt(strArr[i]);
if (page < 0 || page > 9) {
System.out.println("Invalid page number!");
referenceString = null;
break;
}
referenceString[i] = page;
}
if (referenceString != null) {
System.out.println("Reference string set to " + input.next() + ".");
}
}
}
break;
case 3:
if (n == 0) {
System.out.println("Please enter the value of N first!");
} else if (referenceString == null) {
System.out.println("Please enter the reference string first!");
} else {
System.out.println("Simulating the OPT algorithm...");
simulateOPT();
}
break;
case 4:
if (n == 0) {
System.out.println("Please enter the value of N first!");
} else if (referenceString == null) {
System.out.println("Please enter the reference string first!");
} else {
System.out.println("Simulating the NEW algorithm...");
simulateNEW();
}
break;
default:
System.out.println("Invalid choice!");
break;
}
System.out.println();
} while (choice != 0);
}
private static void simulateOPT() {
pageFaults = 0;
int len = referenceString.length;
System.out.println("Reference String\tPhysical Frames\tPage Faults\tVictim Pages");
for (int i = 0; i < len; i++) {
int page = referenceString[i];
boolean found = false;
for (int j = 0; j < n; j++) {
if (physicalFrames[j] == page) {
found = true;
break;
}
}
if (!found) {
pageFaults++;
int maxDist = 0;
int victimPage = -1;
for (int j = 0; j < n; j++) {
int dist = 0;
for (int k = i + 1; k < len; k++) {
dist++;
if (physicalFrames[j] == referenceString[k]) {
break;
}
}
if (dist > maxDist) {
maxDist = dist;
victimPage = j;
}
}
physicalFrames[victimPage] = page;
victimPages[i] = physicalFrames[victimPage];
} else {
victimPages[i] = -1;.
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Java if else condition - powerpoint persentation
- 2. Syntax if (condition) { // block of code to be executed if the condition is true } eg:- if(true){ System.out.println("This code executed"); }
- 3. Example 1 System.out.println("Before if condition"); if(true){ System.out.println("This code executed"); } System.out.println("After If condition");
- 4. Example 2 System.out.println("Before if condition"); if(false){ System.out.println("This code not executed"); } System.out.println("After If condition");
- 5. Example 3 int number = 10; System.out.println("Before if condition"); if(number > 0 ){ System.out.println("Positive value found"); } System.out.println("After If condition");
- 6. Example 4 int number = -10; System.out.println("Before if condition"); if(number < 0 ){ System.out.println("Negative value found"); } System.out.println("After If condition");
- 7. Example 5 int number = 10; System.out.println("Before if condition"); if(number == 10 ){ System.out.println("number is equal to 10"); } System.out.println("After If condition");
- 8. Example 6 int number = 100; System.out.println("Before if condition"); if(number != 10 ){ System.out.println("number is not equal to 10"); } System.out.println("After If condition");
- 9. Example 7 int number = 100; System.out.println("Before if condition"); if(number > 10 ){ System.out.println("number is larger than 10"); }else{ System.out.println("number is less than 10"); } System.out.println("After If condition");
- 10. Example 8 int x = 30; if( x == 10 ) { System.out.print("Value of X is 10"); }else if( x == 20 ) { System.out.print("Value of X is 20"); }else if( x == 30 ) { System.out.print("Value of X is 30"); }else { System.out.print("This is else statement"); }
- 11. Example 9 int number = 10; System.out.println("Before if condition"); if(number != 10 ){ System.out.println("number is not equal to 10"); }else{ System.out.println("number is equal to 10"); } System.out.println("After If condition");
- 12. Example 10 int number = 100; System.out.println("Before if condition"); if(number > 10 ){ System.out.println("number is larger than 10"); }else if(number >50){ System.out.println("number is larger than 50"); }else{ System.out.println("number is smaller than 10"); } System.out.println("After If condition");
- 13. In Class Activity ●Develop the code to check following conditions ●if number is larger than 50 no need to check is that larger than 10 ●if the number is between 10 and 50 then application should print "Number is larger than 10 and less than 50"
- 14. Example 11 int number = 100; System.out.println("Before if condition"); if(number > 10 ){ System.out.println("number is larger than 10"); if(number >50){ System.out.println("number is larger than 50"); } else{ System.out.println("number is smaller than 10"); } System.out.println("After If condition");
- 15. In class Activity Compress the above code
- 16. Quiz