Download solu for sec3

// Exercise5_2.java: Create a method for summarizing digits in an int
public class Exercise5_2 {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
System.out.print("Enter a number: ");
int value = input.nextInt();
System.out.println("The sum of digits for " + value +
" is " + sumDigits(value));
}
public static int sumDigits(long n) {
int temp = (int)Math.abs(n);
int sum = 0;
while (temp != 0) {
int remainder = temp % 10;
sum += remainder;
temp = temp / 10;
}
return sum;
}
}
public class Exercise5_4
{
public static void main(String[] args)
{
System.out.println(reverse(12345));
}
public static int reverse(int number)
{
int result = 0;
while (number != 0)
{
int remainder = number % 10;
result = result * 10 + remainder;
number = number / 10;
}
return result;
}
}
public class Exercise5_6 {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
System.out.print("Enter line number: ");
int lineNumber = input.nextInt();
displayPattern(lineNumber);
}
public static void displayPattern(int n) {
for (int row = 1; row <= n; row++) {
// Print spaces
for (int i = row; i < n; i++)
System.out.print(" ");
// Print numbers
for (int i = row; i >= 1; i--)
System.out.print(" " + i);
System.out.println();
}
}
}