Thread: A Few Quick, Easy Questions

Hello! I'm completely new to Java, and I have small questions I must answer weekly for my class. Here are the questions, along with my answers. Can you please tell me if I did them correctly, and if I didn't, what I did wrong and how to fix them? I tried my best :X I don't want to submit them unless they're right b/c I obviously I won't get any credit if they're wrong.

1. Write a public method called largerStr, which is passed two Strings, s1 and s2, and returns true if s1 is strictly longer than s2, false otherwise.

Example: largerStr("here", "there") --> false
Example: largerStr("there", "here") --> true
Example: largerStr("hear", "here") --> false

A:
I'm pretty sure this one is incorrect.

public bool largerStr(string s1, string s2)
{
return (s1.length>s2.length);
}

2. Write a public method called signFlip, which is passed a double and returns that value with the opposite sign.

Example1: 4.0 --> -4.0
Example2: -3.14 --> 3.14

Note that in this example you must write a complete method, including the method header line.

A:

public double signFlip(double x)
{
return (x * -1.0)
}

3. Write a public method called doubleOut, which is passed a String as a parameter, and which prints to the console that String concatenated with itself. Note that this method does not return anything.

Example: "boo" --> prints out booboo

Note that in this example you must write a complete method, including the method header line.

A:
I'm pretty sure I didn't do this one correctly either.

public void doubleOut(string x)
{
System.out.println(x + x);
}

4. Write a public method called sumNumbers, which is passed a positive int as a parameter and returns the sum of the positive numbers that are less than or equal to the supplied int.

Example: 5 --> 15 since (5 + 4 + 3 + 2 + 1) = 15
Example: 3 --> 6 since (3 + 2 + 1) = 6

Note that in this example you must write a complete method, including the method header line.

A:

public int sumNumbers(int x)
{
int sum=0;
for (int i=x; i>0; i--)
{sum+=i;}
return sum;
}

Thanks for you help!!!

P.S. Sorry if I posted this in the wrong forum :X