/*************************************************** Name: Date: Homework #7 Program name: HexUtilitySOLUTION Program description: Accepts hexadecimal numbers as input. Valid input examples: F00D, 000a, 1010, FFFF, Goodbye, BYE Enter BYE (case insensitive) to exit the program. ****************************************************/ import java.util.Scanner; public class HexUtilitySOLUTION { public static void main(String[] args) { // Maximum length of input string final byte INPUT_LENGTH = 4; String userInput = ""; // Initialize to null string Scanner input = new Scanner(System.in); // Process the inputs until BYE is entered do { // Input a 4 digit hex number System.out.print("\nEnter a hexadecimal string, or enter BYE to quit: "); userInput = input.next().toUpperCase(); // Process the input switch (userInput) { case "BYE": break; default: if (userInput.length() != INPUT_LENGTH) { // Input length is incorrect System.out.printf(" The input %s is the wrong length, it should be %d characters long.\n", userInput, INPUT_LENGTH); break; } // Input length is correct if (isValidHex(userInput)) { //Call method isValidHex // The input is a valid hexadecimal string System.out.printf(" The input %s is a valid hexadecimal value.\n", userInput); } else { // String is either the wrong length or is not a valid hexadecimal string System.out.printf(" The input %s is not a valid hexadecimal value.\n", userInput); } break; } } while (!userInput.equals("BYE")); // Exit the program System.out.println("\nGoodbye!"); input.close(); } // Method to validate the input. // This method returns true or false to the caller (main). // This method accepts one parameter - the user input. public static boolean isValidHex(String userIn) { boolean isValid = false; // The length is correct, now check that all characters are legal hexadecimal digits for (int i = 0; i < userIn.length(); i++) { char thisChar = userIn.charAt(i); // Is the character a decimal digit (0..9)? If so, advance to the next character if (Character.isDigit(thisChar)) { isValid = true; } else { // Character is not a decimal digit (0..9), is it a valid hexadecimal digit (A..F)? if ((thisChar >= 'A') && (thisChar <= 'F')) { isValid = true; } else { // Found an invalid digit, no need to check other digits, exit this loop isValid = false; break; } } } // Returns true if the string is a valid hexadecimal string, false otherwise return isValid; } }
Note: Could you plz go through this code and let me
know if u need any changes in this.Thank You
=================================
// Matrix.java
import java.util.Scanner;
public class Matrix {
public static void main(String[] args) {
int row, col;
char chioice;
/*
* Creating an Scanner class object
which is used to get the inputs
* entered by the user
*/
Scanner sc = new
Scanner(System.in);
while (true) {
// Getting the
input entered by the user
System.out.print("Enter no of rows :");
row =
sc.nextInt();
if (row < 1
|| row > 4) {
System.out.println("** Invalid.Must be between
1-4 **");
} else
break;
}
while (true) {
// Getting the
input entered by the user
System.out.print("Enter no of cols :");
col =
sc.nextInt();
if (col < 1
|| col > 4) {
System.out.println("** Invalid.Must be between
1-4 **");
} else
break;
}
int array[][] = new
int[row][col];
for (int i = 0; i < row; i++)
{
for (int j =
0; j < col; j++) {
System.out.print("Enter Element in row#" + (i) +
" column#"
+ (j) +
":");
array[i][j] = sc.nextInt();
}
}
while (true) {
System.out.println("\nP Print matrix");
System.out.println("R Reverse Rows ");
System.out.println("S ColumnSum");
System.out.println("T Transpose");
System.out.println("Q Quit");
chioice =
sc.next().charAt(0);
switch (chioice)
{
case 'P':
case 'p':
{
printMatrix(array);
continue;
}
case 'R':
case 'r':
{
reverseMatrix(array);
continue;
}
case
'S':
case 's':
{
columnSum(array);
continue;
}
case 'T':
case 't':
{
transpose(array);
continue;
}
case 'Q':
case 'q':
{
break;
}
default: {
System.out.println("** Invalid Choice
**");
}
}
break;
}
}
private static void transpose(int[][] array)
{
for(int i=0;i<array[0].length;i++)
{
for(int j=0;j<array.length;j++)
{
System.out.print(array[j][i]+" ");
}
System.out.println();
}
}
private static void columnSum(int[][] array)
{
int sum=0;
for (int i = 0; i <
array.length; i++) {
for (int j = 0;
j < array[0].length; j++) {
System.out.print(array[i][j] + " ");
}
System.out.println();
}
for(int
j=0;j<array[0].length;j++)
{
sum=0;
for(int
i=0;i<array.length;i++)
{
sum+=array[i][j];
}
System.out.print(sum+" ");
}
System.out.println();
}
private static void reverseMatrix(int[][] array)
{
for(int j = 0; j < array.length;
j++){
for(int i = 0; i <
array[j].length / 2; i++) {
int temp = array[j][i];
array[j][i] =
array[j][array[j].length - i - 1];
array[j][array[j].length - i - 1] =
temp;
}
}
}
private static void printMatrix(int[][] array)
{
for (int i = 0; i <
array.length; i++) {
for (int j = 0;
j < array[0].length; j++) {
System.out.print(array[i][j] + " ");
}
System.out.println();
}
}
}
=======================================
Output:
Enter no of rows :3
Enter no of cols :2
Enter Element in row#0 column#0:0
Enter Element in row#0 column#1:1
Enter Element in row#1 column#0:10
Enter Element in row#1 column#1:11
Enter Element in row#2 column#0:20
Enter Element in row#2 column#1:21
P Print matrix
R Reverse Rows
S ColumnSum
T Transpose
Q Quit
p
0 1
10 11
20 21
P Print matrix
R Reverse Rows
S ColumnSum
T Transpose
Q Quit
R
P Print matrix
R Reverse Rows
S ColumnSum
T Transpose
Q Quit
p
1 0
11 10
21 20
P Print matrix
R Reverse Rows
S ColumnSum
T Transpose
Q Quit
s
1 0
11 10
21 20
33 30
P Print matrix
R Reverse Rows
S ColumnSum
T Transpose
Q Quit
T
1 11 21
0 10 20
P Print matrix
R Reverse Rows
S ColumnSum
T Transpose
Q Quit
Q
=====================Could you plz rate me
well.Thank You
/*************************************************** Name: Date: Homework #7 Program name: HexUtilitySOLUTION Program description: Accepts hexadecimal numbers as input. Valid...
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