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[NEW]I need help with java programming caculating averages

 
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muffinman177
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PostPosted: Sat Oct 04, 2008 11:43 pm    Post subject: [NEW]I need help with java programming caculating averages Reply with quote
Code:
import java.util.Scanner;
public class TestAverage
{
   public static void Howmany()
   {
      
      Scanner kb = new Scanner(System.in);
      String one, two, three, four, five, test;
      int testone, testtwo, testthree, testfour, testfive, average;
      
      one = "one";
      two = "two";
      three = "three";
      four = "four";
      five = "five";
      
      System.out.println("How many tests do you have?..Please type using letters!");
      
      test = kb.nextLine();
      
      if (test.equals(one))
      {
         System.out.println("Please enter one test grade");
         testone = kb.nextInt();
         System.out.println("You're test average is: "+testone);
      }
      else if (test.equals(two))
      {
         System.out.println("Please enter two test grades");
         testone = kb.nextInt();
         testtwo = kb.nextInt();
         average = (testone+testtwo)/2;   
      
         System.out.println("You're test average is: "+average);
      }
      else if (test.equals(three))
      {
         System.out.println("Please enter three test grades");
         testone = kb.nextInt();
         testtwo = kb.nextInt();
         testthree = kb.nextInt();
         average = (testone+testtwo+testthree)/3;   
      
         System.out.println("You're test average is: "+average);   
      }
      else if (test.equals(four))
      {
         System.out.println("Please enter four test grades");
         testone = kb.nextInt();
         testtwo = kb.nextInt();
         testthree = kb.nextInt();
         testfour = kb.nextInt();
         average = (testone+testtwo+testthree+testfour)/4;   
      
         System.out.println("You're test average is: "+average);   
      }
      else if (test.equals(five))
      {
         System.out.println("Please enter five test grades");
         testone = kb.nextInt();
         testtwo = kb.nextInt();
         testthree = kb.nextInt();
         testfour = kb.nextInt();
         testfive = kb.nextInt();
         average = (testone+testtwo+testthree+testfour+testfive)/5;   
      
         System.out.println("You're test average is: "+average);   
      }
      else
      {
         System.out.println("Ok fine... only numbers one through five :)");
      }
      
      
   
   }
   public static void main(String[]args)
   {
      Howmany();
   }
}


ok..
this works.. but is there a more efficient way to make a program like this? as in.. without having to make a new else ststment for each number of tests

im in computer science I.. and were just beginning to learn how to use the Scanner utility and i kinda read ahead.. but i still wanna know how :]
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Snootae
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PostPosted: Sun Oct 05, 2008 12:11 am    Post subject: Reply with quote
try this: (read down for explanation)
Code:
import java.util.Scanner;
public class TestAverage
{
   public static void Howmany()
   {
       
      Scanner kb = new Scanner(System.in);
      String one, two, three, four, five;
      int testamount, testone, testtwo, testthree, testfour, testfive, average;
     
      System.out.println("How many tests do you have?..Please type using numbers!");
       
      testamount = kb.nextLine();
       

 System.out.println("Please enter " + testamount + " test grade/s");


if (test >= 1)) {
testone = kb.nextInt(); }
if (test >= 2)) {
testtwo = kb.nextInt(); }
if (test >= 3)) {
testthree = kb.nextInt(); }
if (test >= 4)) {
testfour = kb.nextInt(); }
if (test >= 5)) {
testfive = kb.nextInt(); }

if (testamount = 1) {
average = (testone)/testamount;
}
if (testamount = 2) {
average = (testone, testtwo)/testamount;
}
if (testamount = 3) {
average = (testone, testtwo, testthree)/testamount;
}
if (testamount = 4) {
average = (testone, testtwo, testthree, testfour)/testamount;
}
if (testamount = 5) {
average = (testone, testtwo, testthree, testfour, testfive)/testamount;
}

  System.out.println("You're test average is: "+average);   
   
   }


   public static void main(String[]args)
   {
      Howmany();
   }
}

i dont know any java, but i should be able to help you

for starters, you should be ble to change this:
System.out.println("Please enter five test grades");
into something with a variable in it, ie:
Code:
System.out.println("Please enter " + test + " test grades");


not sure exactly how that will work in java, but the idea is the test variable holds the right string, say one two three, so you dont need an if for every one

an easier way to get the right amount of inputs would be have
Code:
 System.out.println("How many tests do you have?..Please type using [b]numbers[/b]!");
testint = kb.nextLine();


so your test will be a number (1 2 3 4 5)

after that, you can use something like:

if (test >= 1)) {
testone = kb.nextInt(); }
if (test >= 2)) {
testtwo = kb.nextInt(); }
if (test >= 3)) {
testthree = kb.nextInt(); }
if (test >= 4)) {
testfour = kb.nextInt(); }
if (test >= 5)) {
testfive = kb.nextInt(); }

so if test is greater than or equal to two, it will ask for two numbers, and so on

this code will probably not directly work, as i dont know java, but this is a rough idea, and will make your code a fifth of the size
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DoomsDay
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PostPosted: Sun Oct 05, 2008 1:17 am    Post subject: Reply with quote
Code:
class AvgCalc
{
   public static void main(String [] args)
   {
      Scanner in = new Scanner(System.in);
      System.out.print("Please enter a list of grades, terminate with -1: ");
      int gc = 0;
      int sum = 0;
      for (int t = 0; t!= -1; t = in.nextInt())
      {
         sum +=t;
         gc++;
      }
      System.out.println("The average is " + 1.0 * sum / gc);
   }
}
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muffinman177
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PostPosted: Sun Oct 05, 2008 8:12 pm    Post subject: Reply with quote
DoomsDay wrote:
Code:
class AvgCalc
{
   public static void main(String [] args)
   {
      Scanner in = new Scanner(System.in);
      System.out.print("Please enter a list of grades, terminate with -1: ");
      int gc = 0;
      int sum = 0;
      for (int t = 0; t!= -1; t = in.nextInt())
      {
         sum +=t;
         gc++;
      }
      System.out.println("The average is " + 1.0 * sum / gc);
   }
}


calculations are wrong.. and could you explain how to use "for"
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lurc
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PostPosted: Sun Oct 05, 2008 8:23 pm    Post subject: Reply with quote
for (Initialize variables; Condition-to-loop; What-to-do-at-the end-of-every-loop)
{
}
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Polynomial
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PostPosted: Mon Oct 06, 2008 12:35 am    Post subject: Reply with quote
Just to expand on what lurc said:

The for loop allows you to execute code a number of times:

Code:
for(int i = 0; i < 10; i++)
{
    // Code here
}


The "code here" line would be executed 10 times. What the first line means is "initialize a variable called i and set it to 1, then loop through this code while i < 10. at the end of each loop, add one to i". For the first time the loop goes round, i would be zero. The second time i would be 1, until the last loop where i would be 9. At this point, the i++ is executed and i becomes 10, which means i < 10 is no longer true and the loop exits.

So, if I wanted to write "Looping is fun!" twenty times to the screen, I could do this:

Code:
for(int i = 0; i < 20; i++)
{
    System.out.println("Looping is fun!");
}


And there we have it. You can use any logical expression instead of i < 20, for example i > 12 or i <= n. You can also loop downwards by using i-- instead of i++.

Here's a simple little application to print out the times tables from 0x0 to 10x10:
Code:
for(int a = 0; a <= 10; a++)
{
    for(int b = 0; b <= 10; b++)
    {
        System.out.println(a + " x " + b + " = " + a * b);
    }
}


Hope I've not messed anything up there, I've not coded Java in years!
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HalfPrime
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PostPosted: Mon Oct 06, 2008 12:46 am    Post subject: Reply with quote
Code:
c=0;
while(c<5){
dosomethinghere;
c++;}

==
Code:
for(c=0;c<5;c++){
dosomethinghere;}


So you could just replace
[code[if (test >= 1)) {
testone = kb.nextInt(); }
if (test >= 2)) {
testtwo = kb.nextInt(); }
if (test >= 3)) {
testthree = kb.nextInt(); }
if (test >= 4)) {
testfour = kb.nextInt(); }
if (test >= 5)) {
testfive = kb.nextInt(); } [/code]
with
Code:
for(numentered=0, total = 0;numentered <test;numentered++)) {
total += kb.nextInt(); }
avg = total/test;

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DoomsDay
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PostPosted: Mon Oct 06, 2008 2:43 am    Post subject: Reply with quote
muffinman177 wrote:
DoomsDay wrote:
Code:
.
.
.


calculations are wrong.. and could you explain how to use "for"
My bad, make that (1.0 * sum) / (gc-1)
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nog_lorp
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PostPosted: Thu Oct 09, 2008 2:56 am    Post subject: Reply with quote
Was gonna say, way to convert the truncated int into a float noob Very Happy.

Calculations were wrong because the 'int' type cannot handle decimals and such, so it round them down to the nearest whole number. You could do it without being a lil' smartass by casting it to float. (float) a / (float) b.

For loops accept three expressions separated by semicolons.

for (initialize loop variables; loop condition; increment loop variables)

Is the traditional form, but it isn't super strict, you could do
for(int i; i<100; System.out.print("MOO"));
just to be a dumbass.

Also, doomsy, java initializes variables to 0 for you Very Happy

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