/********************** Author this code is Skail **********************/ /** This is also a documentation comment */ import java.util.Scanner; class MyClass { public static void main(String[] args) { System.out.println("Hello World"); // this is a single-line comment int x = 5; // a single-line comment after code System.out.println(x); /* This is also a comment spanning multiple lines */ String name = "Skail"; int number = 5; double temp = 10.55; char sym = 'D'; boolean car = false; int xx = 5, yy = 10; double lat = 10.456, lon = 78.895; System.out.println("lat = "+lat+"; lon = "+lon+";"); System.out.println(" "); operation(); user_scanner(); condition(); loop(); massiv(); } public static void operation() { int sum1 = 50 + 10; int sum2 = sum1 + 66; int sum3 = sum2 + sum2; System.out.println("sum1 = "+sum1+"; sum2 = "+sum2+"; sum3 = "+sum3+";"); sum1 = 1000 - 10; sum2 = sum1 - 5; sum3 = sum1 - sum2; System.out.println("sum1 = "+sum1+"; sum2 = "+sum2+"; sum3 = "+sum3+";"); sum1 = 1000 * 2; sum2 = sum1 * 10; sum3 = sum1 * sum2; System.out.println("sum1 = "+sum1+"; sum2 = "+sum2+"; sum3 = "+sum3+";"); int sum11 = 1000 / 5; double sum12 = sum11 / 3; double sum13 = sum11 / sum12; System.out.println("sum11 = "+sum11+"; sum12 = "+sum12+"; sum13 = "+sum13+";"); int value = 23; int res = value % 6; // res is 5 System.out.println("res = "+res+";"); int x = 34; int y = ++x; // y is 35 System.out.println("y = "+y+"; x = "+x+";"); x = 34; y = --x; // y is 33 System.out.println("y = "+y+"; x = "+x+";"); x = 34; y = x++; // y is 34 System.out.println("y = "+y+"; x = "+x+";"); x = 34; y = x--; // y is 34 System.out.println("y = "+y+"; x = "+x+";"); int num1 = 4; int num2 = 8; num2 += num1; // num2 = num2 + num1; System.out.println("num1 = "+num1+"; num2 = "+num2+";"); num1 = 4; num2 = 8; num2 -= num1; // num2 = num2 - num1; System.out.println("num1 = "+num1+"; num2 = "+num2+";"); String firstName, lastName; firstName = "David"; lastName = "Williams"; System.out.println("My name is " + firstName + " " + lastName); // Prints: My name is David Williams } //end operation(); public static void user_scanner() { System.out.println("What is your name?"); Scanner myVar = new Scanner(System.in); System.out.println("Hello "+myVar.nextLine()); //Считать байт - nextByte() //Считать число типа short - nextShort() //Считать число типа int - nextInt() //Считать число типа long - nextLong() //Считать число типа float - nextFloat() //Считать число типа double - nextDouble() //Считать число булевого типа - nextBoolean() //Считать целую строку - nextLine() //Считать слово - next() } // end user_scanner(); public static void condition() { //example 1 int age = 25; if (age > 0) { if (age > 16) { System.out.println("Welcome!"); //Outputs "Welcome!" } else { System.out.print("Too Young"); } } else { System.out.println("Error"); } //example 2 age = 25; if (age <= 0) { System.out.println("Error"); } else if (age <= 16) { System.out.println("Too Young"); } else if (age < 100) { System.out.println("Welcome!"); //Outputs "Welcome!" } else { System.out.println("Really?"); } //example 3 age = 25; int money = 600; if (age > 18 && money > 500) { System.out.println("Welcome!"); } //example 4 age = 25; money = 100; if (age > 18 || money > 500) { System.out.println("Welcome!"); } //Outputs "Welcome!" //example 5 age = 25; if (!(age > 18)) { System.out.println("Too Young"); } else { System.out.println("Welcome"); } //Outputs "Welcome" //example 6 int day = 3; switch(day) { case 6: System.out.println("Saturday"); break; case 7: System.out.println("Sunday"); break; default: System.out.println("Weekday"); } // Outputs "Weekday" } //end condition(); public static void loop() { //example 1 - while int x = 3; while (x > 0) { System.out.println(x); x--; } /* Outputs 3 2 1 */ //example 2 - while x = 6; while (x < 10) { System.out.println(x); x++; } System.out.println("Loop ended"); /* 6 7 8 9 Loop ended */ //example 3 - for for (x = 1; x <= 5; x++) { System.out.println(x); } /* Outputs 1 2 3 4 5 */ //example 4 - for for (x=0; x<=10; x=x+2) { System.out.println(x); } /* 0 2 4 6 8 10 */ //example 5 - do...while x = 1; do { System.out.println(x); x++; } while (x < 5); /* 1 2 3 4 */ //example 6 - do...while x = 1; do { System.out.println(x); x++; } while (x < 0); //Outputs 1 //example 7 - break x = 1; while (x > 0) { System.out.println(x); if (x == 4) { break; } x++; } /* Outputs 1 2 3 4 */ //example 8 - continue for (x=10; x<=40; x=x+10) { if (x == 30) { continue; } System.out.println(x); } /* Outputs 10 20 40 */ } //end loop public static void massiv () { // Example 1 int[] arr = new int[5]; float arr1[] = new float[10]; String[] myNames = { "A", "B", "C", "D"}; System.out.println(myNames[2]); //Output "C" // Example 2 int[] intArr = new int[5]; System.out.println(intArr.length); //Outputs 5 // Example 3 int[] myArr = {6, 42, 3, 7}; int sum=0; for (int x=0; x < myArr.length; x++) { sum += myArr[x]; } System.out.println(sum); // 58 // Example 4 int[] primes = {2, 3, 5, 7}; for (int t: primes) { System.out.println(t); } /* 2 3 5 7 */ // Example 5 int[][] sample = { {1, 2, 3}, {4, 5, 6} }; int x = sample[1][0]; System.out.println(x); // Outputs 4 int[][] myArr1 = { {1, 2, 3}, {4}, {5, 6, 7} }; myArr1[0][2] = 42; x = myArr1[1][0]; // 4 } }

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