Write code to take a String input from the user, then print the first and last letters of the string on one line. Sample run: Enter a string: surcharge se Hint - we saw in the lesson how to get the first letter of a string using the substring method. Think how you could use the .length() String method to find the index of the last character, and how you could use this index in the substring method to get the last character.
Answers
//import the Scanner class to allow for user input
import java.util.Scanner;
//Begin class definition
public class FirstAndLast{
//Begin the main method
public static void main(String []args){
//****create an object of the Scanner class.
//Call the object 'input' to receive user's input
//from the console.
Scanner input = new Scanner(System.in);
//****create a prompt to tell the user what to do.
System.out.println("Enter the string");
//****receive the user's input
//And store it in a String variable called 'str'
String str = input.next();
//****get and print the first character.
//substring(0, 1) - means get all the characters starting
//from the lower bound (index 0) up to, but not including the upper
//bound(index 1).
//That technically means the first character.
System.out.print(str.substring(0,1));
//****get and print the last character
//1. str.length() will return the number of character in the string 'str'.
//This is also the length of the string
//2. substring(str.length() - 1) - means get all the characters starting
// from index that is one less than the length of the string to the last
// index (since an upper bound is not specified).
// This technically means the last character.
System.out.print(str.substring(str.length()-1));
} // end of main method
} //end of class definition
Explanation:The code has been written in Java and it contains comments explaining important parts of the code. Kindly go through the comments.
The source code and a sample output have also been attached to this response.
To run this program, copy the code in the source code inside a Java IDE or editor and save it as FirstAndLast.java
Related Questions
The following are three possible logon scenarios. Explain why option (c) below is preferable in terms of system security. a. Welcome to XYZ computing Enter username: jones Invalid username Enter username: b. Welcome to XYZ computing Enter username: smith Enter password: password Invalid access Enter username: c. Enter username: smith Enter password: password Invalid access Enter username: smith Enter password: FpQr56 Welcome to XYZ computing
Answers
Answer:
because the password being used is of high quality
Explanation:
Option C is the most preferable in terms of system security because the password being used is of high quality. Meaning that it contains lower case and capital case letters as well as numbers. It is also a random mix of all three and is not a common word or name. The length of the password is normal but could be longer for better safety. These things make it very difficult and time-consuming for a software program to guess the password, and nearly impossible for an individual to guess.
Static methods can be called directly from the name of the class that contains the method.
a. True
b. False
Answers
Which year was the Apple 2 released?
A) 1979
B). 1973
C). 1980
D). 1977
Answers
Answer:
1977
Explanation:
Apple 2 was released in April 19th 1977
Which of the following passes an int argument into a method named print? Chose one option and explain why.
o print();
o print()+5;
o print("5");
o print(5);
Answers
Answer:
print(5)
Explanation:
Passing an int argument into the method named print ;
print() ; Here, the print method has no argument as it is empty
print()+5; Here also, the print method has no argument and adding +5 is an invalid syntax.
print("5") ; Here, print takes in an argument, however, the argument is a string due to the fact that 5 is enclosed by quotation marks.
print(5) ; Here, the integer is 5 is passed to the print method.
name the cell range selected in the given worksheet?
plzzz helppppp
Answers
Answer:
B2:E6,,,,,,,,,,,,,,,,
Can you think of other businesses that might benefit from using voice response this system?
Answers
Answer:
call centers benfit big in this field
Explanation:
You are the IT administrator for a small corporate network. The employee in Office 1 occasionally needs a previous version of her report files. You need to configure her computer so that you can restore the computer to a point in time if needed. In this lab, your task is to complete the following:
Turn on system protection on the C: volume and set a maximum of 5% of disk space for system protection. Turn on system protection on the D: volume and set a maximum of 5% of disk space for system protection. Create a manual restore point. When naming the restore point, choose your own name for the restore point.
Answers
Answer:
Explanation:
Assuming you have Windows 8 or 10 as the operating system, you would need to do the following. In the search input in the taskbar search for "Create a System Restore Point". In this window, navigate to the System Protection tab. Here, you need to click on the drive you want, we can do C first, and click on the button that says "configure". Here you want to turn on System Protection and set the disk space to 5%. Now click apply and ok and repeat for drive D.
Once that is done you will need to create a manual restore point by clicking the button that says create and giving it the name of your choice.
% Do not modify CalculateSum function maxSum = CalculateSum(userNum1, userNum2, userNum3) maxSum = MaxValue(userNum1, userNum2) + userNum3; end % Define a function MaxValue that returns the largest input value % Function inputs: numA, numB % Function output: maxNum % function maxNum ...
Answers
Answer:
The function in Python is as follows:
def MaxValue(userNum1, userNum2):
if userNum2>userNum1:
return userNum2
else:
return userNum1
Explanation:
This defines the function
def MaxValue(userNum1, userNum2):
This returns userNum2 if userNum2 is greater than userNum1
if userNum2>userNum1:
return userNum2
If otherwise, this returns userNum1
else:
return userNum1
Claire needs to make an SRS document. Help her identify the given section and subsection.
The ___ subsection mentions the list of factors that may influence the requirements specified in the SRS. This subsection is part of the section named ___
Blank 1:
A. Scope
B. Purpose
C. Assumptions
Blank 2:
A. Introduction
B. General Description
C. Specific Requirements
Answers
Answer:
C and B in that order
Explanation:
give one word • pressure exerted by a stationary liquid _______. • force in a direction perpendicular to a given surface area _______. • a pair of forces whose resultant is zero _______.
Answers
Answer:
1. Hydrostatic pressure.
2. Pressure.
3. Equilibrium forces.
Explanation:
1. Hydrostatic pressure: pressure exerted by a stationary liquid. It is simply the pressure in a liquid such as water at a specific depth.
Mathematically, hydrostatic pressure is given by the formula;
[tex] H.P = rho * g * d [/tex]
Where:
H.P is the hydrostatic pressure of a liquid.rho represents the density of a liquid.g is the acceleration due to gravity.d is the depth (height) of a liquid.2. Pressure: it is the force in a direction perpendicular to a given surface area. Thus, it's typically measured in Newton per meters (N/m²).
Mathematically, pressure is given by the formula;
[tex] Pressure = \frac {Force}{area} [/tex]
3. Equilibrium forces: a pair of forces whose resultant is zero. It is also referred to as balanced forces because the resultant of all the pair of forces acting on a body or system is at equilibrium (balanced).
write a java program to input two double type numbers and by using suitable mathematical functions print the maximum and minimum numbers out of the two numbers.
[tex]java \: me \: likhna \: ok[/tex]
Answers
Answer:
The program in Java is as follows:
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
double n1, n2;
n1 = input.nextDouble();
n2 = input.nextDouble();
double Max = Math.max(n1,n2);
double Min = Math.min(n1,n2);
System.out.println("Max: "+Max);
System.out.println("Min: "+Min); }}
Explanation:
This declares the numbers
double n1, n2;
This gets input for n1
n1 = input.nextDouble();
This gets input for n2
n2 = input.nextDouble();
This gets the max of both using the max function
double Max = Math.max(n1,n2);
This gets the min of both using the min function
double Min = Math.min(n1,n2);
This prints the max
System.out.println("Max: "+Max);
This prints the min
System.out.println("Min: "+Min);
What component can you use to open windows?
-A servomotor
-An LED
-A buzzer
-An ambient light sensor
Answers
Answer:
A servomotor.
Explanation:
Because you can only open the window with the force given by the servo motor.I am not sure tho
Identify the correct statements about run-time errors. Choose all that apply.
Run-time errors occur when the program is running.
Run-time errors cause the program to halt.
Run-time errors cause the program to restart.
Run-time errors occur when a numeric value is expected but a text value is entered.
Run-time errors occur when a text value is expected but a numeric value is entered.
Run-time errors cause the program to run fast.
DONE
Answers
Explanation:
1. Run-time errors occur when the program is running.
2. Run-time errors cause the program to halt.
4. Run-time errors occur when a numeric value is expected but a text value is entered.
5. Run-time errors occur when a text value is expected but a numeric value is entered.
Define a method pyramidVolume with double parameters baseLength, baseWidth, and pyramidHeight, that returns as a double the volume of a pyramid with a rectangular base. Relevant geometry equations: Volume
Answers
Define a method pyramidVolume with double parameters baseLength, baseWidth, and pyramidHeight, that returns as a double the volume of a pyramid with a rectangular base. Relevant geometry equations:
Volume = base area x height x 1/3
Base area = base length x base width.
(Watch out for integer division)
import java.util.Scanner;
public class CalcPyramidVolume {
/* Your solution goes here */
public static void main (String [] args) {
System.out.println("Volume for 1.0, 1.0, 1.0 is: " + pyramidVolume(1.0, 1.0, 1.0));
return;
}
}
Answer:
import java.util.Scanner;
public class CalcPyramidVolume {
/* Your solution goes here */
public static void main (String [] args) {
System.out.println("Volume for 1.0, 1.0, 1.0 is: " + pyramidVolume(1.0, 1.0, 1.0));
return;
}
//Begin method definition
public static double pyramidVolume(double baseLength, double baseWidth, double pyramidHeight){
//First, calculate the base area of the pyramid
//store the result in a double variable
double baseArea = baseLength * baseWidth;
//Then, calculate the volume of the pyramid
//using the base area and the base width
double volume = 1 / 3.0 * baseArea * pyramidHeight;
//return the volume
return volume;
}
}
Output:Volume for 1.0, 1.0, 1.0 is: 0.3333333333333333
Explanation:The code above contains comments explaining the important lines of the code. The output of the code has also been provided above.
The parts of the code that are worth noting are:
(i) The return type of the method pyramidVolume should be a double since calculations are done using double values. i.e the method header should be written as
public static double pyramidVolume(){
}
(ii) The method requires three(3) parameters of type double: baseLength, baseWidth and pyramidHeight. These should be included in the method. Therefore, the complete header definition should be:
public static double pyramidVolume(double baseLength, double baseWidth, double pyramidHeight){
}
(iii) The formula for calculating the volume of the pyramid should be:
volume = 1 / 3.0 * baseArea * baseWidth;
Rather than;
volume = 1 / 3 * baseArea * baseWidth;
This is because integer division yields integer result. If 1 / 3 is evaluated, the result will be 0 since the decimal part will be truncated thereby making the result of the volume = 1 / 3 * baseArea * baseWidth will be 0.
Therefore, the work around for that should be to write 1 / 3.0 or 1.0 / 3.0 or 1.0 / 3.
(iv) After the calculation, the result of volume should be returned by the method. This will enable a proper call by the main method for execution.
People who know about phones, what do you think about the phone "Samsung Galaxy A21s"?
Answers
Answer:
iphone is better but if u like it then ok
Explanation:
Does anyone know how to fix this? Everytime i make a new page it only types in the middle of the page. I want to type at the top
Answers
Answer:maybe start a new page or try hitting delete
Explanation:
A data analyst is using the Color tool in Tableau to apply a color scheme to a data visualization. They want the visualization to be accessible for people with color vision deficiencies, so they use a color scheme with lots of contrast. What does it mean to have contrast
Answers
Answer:
Color contrast is the difference in light between font (or anything in the foreground) and its background.
Explanation:
In web accessibility, how well one color stands out from another color determines whether or not most people will be able to read the information.
Contrast makes things look different and stand out
Complete the steps for adding a recurring event.
1. Click
.
2. Then, choose
.
3. Enter the necessary details, and click
.
4. Specify the recurrence details.
Answers
Answer:
which type of questions is this
Let L be the set of exactly those strings over the alphabet \Sigma = {a, b, c, g}, that satisfy all of the following properties: the length of the string is equal to 5n+3, for some natural number n greater or equal than 0; all of the first (leftmost) 2n symbols are elements of the set {b, c, g}; all of the last (rightmost) 3n symbols are elements of the set {a, b}; the symbols at position 2n+1, 2n+2, and 2n+3 (from the left, i.e., after the first 2n symbols but before the last 3n symbols) are elements of the set {c, g}; Write a complete formal definition of a context free grammar that generates L. If such a context free grammar does not exist, state that the context free grammar does not exist, and prove it.
Answers
Answer:
S -> LSR
S -> M
M -> YYY
Y -> c | g
L -> XX
X -> b | c | g
R -> ZZZ
Z -> a | b
Explanation:
This is a long time ago, but I think this does what you want.
Start symbol S expands to LSR and allows you to grow L and R on either side as much as you want. Ultimately S must be replaced by M. Then you have a pattern like LLLLLMRRRRR.
We can then further break down L into 2 times b, c or g, and similar for M and R.
applications of kinematics in computer engineering
Answers
Answer:
There is a wide application of kinematics; it is also used in astrophysics. In mechanical engineering, robotics, and biomechanics, it is used to describe the motion of the system of the joint parts.
HEEELLPPPPP, ILL GIVE THE BRAIN THING
Which entry by the user will cause the program to halt with an error statement? # Get a guess from the user and update the number of guesses. guess = input("Guess an integer from 1 to 10:") guess = int(guess)
7
-1
5.6
36
Answers
The register in the CPU is not the same as the RAM.
Group of answer choices
True
False
Answers
Synapse is not working and is crashing every time you attach it. What should you do?
1. Contact a staff
2. Wait for it to be fixed
3. delete it
4. Spam dm everyone
Answers
Advantages that excel have over paper and pen work
Answers
Answer:
You can use formulas to create systems on excel.
Explanation:
What are the main dimensions of information system and their components
Answers
Answer:
The dimensions of information systems include organizations, management, and information technology. The key elements of an organization are its people, structure, business processes, politics, and culture. An organization coordinates work through a structured hierarchy and formal standard operating procedures.
When running on its 11.4 V battery, a laptop computer uses 8.3 W. The computer can run on battery power for 7.5 h before the battery is depleted. Part A What is the current delivered by the battery to the computer
Answers
Answer:
The correct answer is "0.73 A".
Explanation:
Given that:
Power,
P = 8.3 W
Voltage,
ΔV = 11.4 V
The current will be:
⇒ [tex]I = \frac{P}{\Delta V}[/tex]
On substituting the values, we get
⇒ [tex]=\frac{8.3}{11.4}[/tex]
⇒ [tex]=0.73 \ A[/tex]
What tells the hardware what to do and how to do it?
Central Processing Unit (CPU)
Software
Hardware
Hard Drive (HDD)
Answers
Answer:
Software
Explanation:
The software tells the hardware what to do and how to do it.
What is not an advantage of a computer network?
Select one:
A.Remote Information Access
B.Interaction among cooperative application programs
C.Social Engineering
D.User Communication
E.Resource Sharing
Answers
Answer:
C. Social Engineering
Explanation:
Social engineering can be defined as an art of manipulating people, especially the vulnerable to divulge confidential information or performing actions that compromises their security.
Basically, it is a manipulative strategy or technique that involves the use of deceptive and malicious activities on unsuspecting victims in order to gain unauthorized access to their confidential or private information for fraud-related purposes. Some examples of social engineering attacks include quid pro quo, spear phishing, baiting, tailgating, water-holing, vishing, pretexting, phishing, etc.
Phishing is an attempt to obtain sensitive information such as usernames, passwords and credit card details or bank account details by disguising oneself as a trustworthy entity in an electronic communication usually over the internet.
Furthermore, phishing is a type of fraudulent or social engineering attack used to lure unsuspecting individuals to click on a link that looks like that of a genuine website and then taken to a fraudulent web site which asks for personal information.
In conclusion, social engineering being a form of cyber attack is not an advantage of a computer network.
A program developed for a Web store represents customer account balances using a format that approximates real numbers. While testing the program, a software developer discovers that some values appear to be mathematically imprecise. Which of the following is the most likely cause of the imprecision?
A. The account balances are represented using a fixed number of bits, resulting in overflow errors.
B. The account balances are represented using a fixed number of bits, resulting in round-off errors.
C. The account balances are represented using an unlimited number of bits, resulting in overflow errors.
D. The account balances are represented using an unlimited number of bits, resulting in round-off errors.
Answers
Answer:
B.
Explanation:
The most likely reason for this would be that the account balances are represented using a fixed number of bits, resulting in round-off errors. Since all of the numbers being used are real numbers they would have a fixed 32 bits of data. When these values are multiplied or divided they can be irrational numbers that never end, and therefore are cut off in order to fit the available data. This would cause the numbers to be rounded and can lead to the answer being imprecise.
Sum-of-minterms form is a _____. a. compact function notation that represents each literal by a number b. product term having exactly one literal for every function variable c. variable appearance in an expression in true or complemented form d. canonical form of a Boolean equation where the right-side expression is a sum-of-products
Answers
Answer: D. canonical form of a Boolean equation where the right-side expression is a sum-of-products
Explanation:
Sum-of-minterms form is refered to as the canonical form of a Boolean equation such that the right-side expression is the sum-of-products.
It should be noted that the minterms whose sum helps in defining the Boolean function will be the ones that give the 1's with regards to the functions in the truth table.