PF Java - Basic Syntax

01. Student Information

public class P01StudentInformation {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String name = scanner.nextLine();
        int age = Integer.parseInt(scanner.nextLine());
        double grade = Double.parseDouble(scanner.nextLine());

        System.out.printf("Name: %s, Age: %d, Grade: %.2f", name, age, grade);
    }
}
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02. Passed

public class P02Passed {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double grade = Double.parseDouble(scanner.nextLine());

        if (grade >= 3) {
            System.out.println("Passed!");
        }
    }
}
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03. Passed or Failed

public class P02Passed {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double grade = Double.parseDouble(scanner.nextLine());

        if (grade >= 3) {
            System.out.println("Passed!");
        } else {
            System.out.println("Failed!");
        }
    }
}
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04. Back In 30 Minutes

public class P04BackIn30Minutes {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int initHour = Integer.parseInt(scanner.nextLine());
        int initMin = Integer.parseInt(scanner.nextLine());

        int allMinutes = (initHour * 60) + initMin + 30;

        int hour = allMinutes / 60;
        int min = allMinutes % 60;

        if (hour > 23) {
            hour = 0;
        }

        System.out.printf("%d:%02d", hour, min);
    }
}
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05. Month Printer

public class P05MonthPrinter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Integer.parseInt(scanner.nextLine());

        String month = "";
        switch (num) {
            case 1: month = "January";break;
            case 2: month = "February";break;
            case 3: month = "March";break;
            case 4: month = "April";break;
            case 5: month = "May";break;
            case 6: month = "June";break;
            case 7: month = "July";break;
            case 8: month = "August";break;
            case 9: month = "September";break;
            case 10: month = "October";break;
            case 11: month = "November";break;
            case 12: month = "December";break;
            default: month = "Error!";
        }

        System.out.println(month);
    }
}
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06. Foreign Languages

public class P06ForeignLanguages {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String country = scanner.nextLine();

        switch (country){
            case "England":
            case "USA":
                System.out.println("English");
                break;
            case "Spain":
            case "Argentina":
            case "Mexico":
                System.out.println("Spanish");
                break;
            default:
                System.out.println("unknown");
        }
    }
}
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07. Theatre Promotion

public class P07TheatrePromotion {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String day = scanner.nextLine();
        int age = Integer.parseInt(scanner.nextLine());

        boolean isNotValid = false;
        int price = 0;
        if (age >= 0 && age <= 18){
            if (day.equals("Weekday")) {
                price = 12;
            } else if (day.equals("Weekend")) {
                price = 15;
            } else if (day.equals("Holiday")) {
                price = 5;
            }
        } else if (age > 18 && age <= 64) {
            if (day.equals("Weekday")) {
                price = 18;
            } else if (day.equals("Weekend")) {
                price = 20;
            } else if (day.equals("Holiday")) {
                price = 12;
            }
        } else if (age > 64 && age <= 122) {
            if (day.equals("Weekday")) {
                price = 12;
            } else if (day.equals("Weekend")) {
                price = 15;
            } else if (day.equals("Holiday")) {
                price = 10;
            }
        } else {
            isNotValid = true;
        }

        if (isNotValid) {
            System.out.println("Error!");
        } else {
            System.out.printf("%d$", price);
        }
    }
}
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08. Divisible by 3

public class P08DivisibleBy3 {
    public static void main(String[] args) {

        for (int i = 3; i <= 100; i += 3) {
            System.out.println(i);
        }
    }
}
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09. Sum of Odd Numbers

public class P09SumOfOddNumbers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Integer.parseInt(scanner.nextLine());

        int sum = 0;
        for (int i = 1; i <= num * 2; i++) {
            if (i % 2 != 0) {
                System.out.println(i);
                sum = sum + i;
            }
        }

        System.out.printf("Sum: %d", sum);
    }
}
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10. Multiplication Table

public class P10MultiplicationTable {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Integer.parseInt(scanner.nextLine());

        for (int i = 1; i <= 10; i++) {
            System.out.printf("%d X %d = %d%n", num, i, num * i);
        }
    }
}
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11. Multiplication Table 2.0

public class P11MultiplicationTable2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Integer.parseInt(scanner.nextLine());
        int times = Integer.parseInt(scanner.nextLine());

        if (times <= 10) {
            for (int i = times; i <= 10; i++) {
                System.out.printf("%d X %d = %d%n", num, i, num * i);
            }
        } else {
            System.out.printf("%d X %d = %d%n", num, times, num * times);
        }
    }
}
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12. Even Number

public class P12EvenNumber {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num = Integer.parseInt(scanner.nextLine());

        while (num % 2 != 0) {
            System.out.println("Please write an even number.");
            num = Integer.parseInt(scanner.nextLine());


//            if (num % 2 == 0) {
//                System.out.printf("The number is: %d", Math.abs(num));
//                break;
//            } else {
//                System.out.println("Please write an even number.");
//                num = Integer.parseInt(scanner.nextLine());
//            }
        }

        System.out.printf("The number is: %d", Math.abs(num));
    }
}
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13. Refactor Sum of Odd Numbers

public class P13RefactorSumOfOddNumbers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());
        int sum = 0;
        for (int i = 0; i < n; i++) {
            System.out.println(2 * i + 1);
            sum += 2 * i + 1;
        }
        System.out.printf("Sum: %d%n", sum);

    }
}