DAY 1

1)

a. 

for(int i = 1; i <= 20; i++){
   if(i % 2 == 0){
     System.out.println(i);
   }
}

OR

for(int i = 2; i <= 20; i+=2){
   System.out.println(i);
}

b. 

for(int i = 30; i <= 50; i++) {
   if(i % 2 != 0) {
     System.out.println(i);
   }
}

OR 

for(int i = 31; i <= 50; i+=2) {
   System.out.println(i);
}


c. 

for(int i = 10; i > 0; i--) {
   System.out.println(i);
}

d. 

int sum = 0;
for(int i = 1; i <= 15; i++) { //runs 15 times
   sum += i * 5;
}
System.out.println(sum);


2) for (int i = 1; i <= 200; i++) {
          if (i % 2 == 0 && i % 3 == 0) {
              System.out.print(i + " ");
          }
      }

3) 

      import java.util.Scanner;

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

              System.out.print("Enter an integer: ");
              int number = input.nextInt();

              System.out.print("Factors: ");

              for (int i = 1; i <= number; i++) {
                  if (number % i == 0) {
                      System.out.print(i + " ");
                  }
              }

              System.out.println();
          }
      }


4)

      import java.util.Scanner;

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

              System.out.print("Enter an integer: ");
              int number = input.nextInt();

              int sum = 0;

              for (int i = number; i > 0; i /= 10) {
                  sum += i % 10;
              }

              System.out.println("Sum of digits: " + sum);
          }
      }

Challenge: Modify your program to also determine the largest digit in the number.

      import java.util.Scanner;

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

              System.out.print("Enter an integer: ");
              int number = input.nextInt();

              int sum = 0;
              int largest = 0;

              for (int i = number; i > 0; i /= 10) {
                  int digit = i % 10;

                  sum += digit;

                  if (digit > largest) {
                      largest = digit;
                  }
              }

              System.out.println("Sum of digits: " + sum);
              System.out.println("Largest digit: " + largest);
          }
      }

5)

      import java.util.Scanner;

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

              System.out.print("Enter a number: ");
              int number = input.nextInt();

              for (int i = 1; i <= 10; i++) {
                  System.out.println(number + " x " + i + " = " + (number * i));
              }
          }
      }

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EXAM REVIEW AND LAB 3 TO BE DISCUSSED IN CLASS

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