Sarah Singh

Hello there!

I am having issues testing my file:'( would be really grateful if someone can come through <3

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File
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import java.util.*; class FormulaDecomposition {    static int currIndex;    public static void countFormulaAtoms(String formula) {     //created an empty string with a capacity of 16        StringBuilder formulaDecomposed = new StringBuilder();        currIndex = 0;        Map<String, Integer> counterMap = parseFormula(formula);        for (String name : counterMap.keySet()) {            formulaDecomposed.append(name);            int multiplicity = counterMap.get(name);            if (multiplicity > 1)                formulaDecomposed.append("" + multiplicity);                    }        System.out.println(new String(formulaDecomposed));    }    public static Map<String, Integer> parseFormula(String formula) {        int length = formula.length();// prints out the number of characters inputed H3O        System.out.println("The length of the formula is: "+length);        Map<String, Integer> counterMap = new TreeMap();      //  0<3 and true        while (currIndex < length && formula.charAt(currIndex) != ')') {            if (formula.charAt(currIndex) == '(') {                currIndex++; //1                // the way this works is [key1=value1, key2=value2]                for (Map.Entry<String, Integer> entry : parseFormula(formula).entrySet()) {                 // get or default specifies the return value to which the specified key is mapped or                 //default value if this map contains no mapping for the key                 /**                 * Replaces each entry's value with the result of invoking the given function on that entry                 *  until all entries have been processed or the function throws an exception.                 * Exceptions thrown by the function are relayed to the caller.                 */                    counterMap.put(entry.getKey(), counterMap.getOrDefault(entry.getKey(), 0) + entry.getValue());                }            } else {                int iStart = currIndex++; //istart is 0, current index is 1                // 1<3(H2O) and currIndex must be lowercase Mg2O                while (currIndex < length && Character.isLowerCase(formula.charAt(currIndex))) currIndex++;                String name = formula.substring(iStart, currIndex); //(substrings 0 to 2 now its has become Mg)                iStart = currIndex; //(iStart = 2)                //2<4 and its a digit at 2nd index meaning Mg"2"; now curindex = 3                while (currIndex < length && Character.isDigit(formula.charAt(currIndex))) currIndex++;                //                int multiplicity = iStart < currIndex ? Integer.parseInt(formula.substring(iStart, currIndex)) : 1;                counterMap.put(name, counterMap.getOrDefault(name, 0) + multiplicity);            }        }        // if there is an ending bracket its just multiplying the number  according to thatbracket        int iStart = ++currIndex;        while (currIndex < length && Character.isDigit(formula.charAt(currIndex))) currIndex++;        if (iStart < currIndex) {            int multiplicity = Integer.parseInt(formula.substring(iStart, currIndex));            for (String key : counterMap.keySet()) {                counterMap.put(key, counterMap.get(key) * multiplicity);            }        }        return counterMap;    }    public static void main(String[] args) {        Scanner in = new Scanner(System.in);        System.out.println("Enter the chemical formula:");        String formula = in.nextLine();        countFormulaAtoms(formula);    } }
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This is the file I am trying to test^
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*****************************JUnit****************************************************************

void testMain() { //fail("Not yet implemented"); String input = "(NaOH)3H2O"; InputStream in = new ByteArrayInputStream(input.getBytes()); System.setIn(in); fstatement.main(null); int index = out.toString().length(); for(int i=0;i<input.length();i++) { index = out.toString().lastIndexOf('\n',index-1); } System.setOut("The index is "+input); // System.out.println(out.toString().); // String actual = (out.toString().substring(index,out.toString().length()-1)); // System.out.println(actual); }
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I am trying to print the expected and the actual output ensuring that they're equal but I am not able to print any output on the console in Junit
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I have searched left and right and I have to do an assignment on critiquing this (title)! Does anyone have links to a poorly documented code? If you can provide me with such a link I'd be soo grateful to you!
Thanks
Regards
Sarah S

Welcome to CodeRanch

Hi, Can someone help me...

package Assignment; import java.awt.*; import java.awt.event.*; import javax.swing.*; import ASwings.MyFrame; public class FormFrame1 extends JFrame{ private JFrame f; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; private JLabel msglabel; FlowLayout experimentLayout = new FlowLayout(); FormFrame1() { prepareGUI(); } private void prepareGUI(){ //making of the frame f = new JFrame("Something about yourself..."); f.setSize(500,500); f.setVisible(true); f.setResizable(false); JPanel pane = new JPanel(); f.getContentPane().add(pane); Container c = getContentPane(); pane.add(c); pane.setLayout(experimentLayout);        experimentLayout.setAlignment(FlowLayout.LEFT);         JLabel l1 = new JLabel("Name"); c.add(l1); JTextField textField = new JTextField("This is a text"); c.add(textField);         } public static void main(String[] args) { FormFrame1  qw = new FormFrame1();   } }
//I am unable to add the textfield on to my container..like it adds but it doesnt display...Can someone decipher as to why..Thanks! ^.^

I'd love to give this book a read Thanks!

Hello there ^.^

I have recently installed DevC++ 5.11 version on my Windows machine. Everytime I run my program I get an error saying, "redefinition of main" and opens a header file "conio.h" simultaneously. I have tried uninstalling and reinstalling the DevC++ several times. And everytime I reinstall, the DevC++ only works first few times before it starts giving me that error D:

I will be really thankful if anyone can point towards what is happening. Any help is greatly appreciated.

Thanks
Regards

@Norm
Yes it is!
Thank you \(^.^)/

@Norm The following is the code and I understand the question I asked now :P
The square brackets, meant array and hence the line hex[15] + hex[1] was referring to array index, hex[15] and hex[1] and the results were being added.
Thanks for looking into my problem \(^.^)/ Much Appreciated!

package Operators;

/* * * //int hex[50];//array declaration statement //hex[15]+hex[1]->16th and 2nd element //arrays only go from 0-49. * * integer -> 4bytes * * * */ public class HexByte { public static void main(String[] args) { char hex [] = {'0','1','2','3','4','5','6','7','8','9', 'a','b','c','d','e','f' }; byte b = (byte) 0xf1;//241 - 11110001 && 00001111 System.out.println("b = 0x" + "b = 0x" + hex[(b>>4) & 0x0f] + hex[b & 0x0f] ); //00001111(15) & 15 11110001 & 00001111 //hex[15] = f hex[1]=1 //hex[15]+hex[1] } }

Thanks everyone who looked into my problem ^.^ And thanks for all the suggestions <3
This is really silly, but I realized thatsome of my print statements are wrong which is why I am not getting expected output D:
Sorry about that :'( Also, there was a bug in java.io.IOException Line which in now fixed \(^.^)/
Regards

Editted Code
package ControlStatements; public class Menu { //private Exception IOException; public static void main(String[] args ) throws java.io.IOException{ char choice; do { System.out.println("Help on: "); System.out.println(" 1. if "); System.out.println(" 2. switch "); System.out.println(" 3. while "); System.out.println(" 4. do - while "); System.out.println(" 5. for\n "); System.out.println("choose one: "); choice = (char) System.in.read(); }while (choice < '1' || choice > '5'); System.out.println("\n"); switch(choice){ case '1': System.out.println("The if:\n"); System.out.println("if (condition) statement;"); System.out.println("else statement"); break; case '2': System.out.println("The switch:\n"); System.out.println("switch (expression) {"); System.out.println(" case constant:"); System.out.println(" statement sequence"); System.out.println(" break;"); System.out.println(" //..."); System.out.println("}"); break; case '3': System.out.println("The while:\n"); System.out.println("while(condition) statement"); break; case '4': System.out.println("The do while:\n"); System.out.println("do {"); System.out.println(" statement;"); System.out.println("} while (condition);"); case '5': System.out.println("The for:\n"); System.out.println("for (init; condition; iteration)"); System.out.println("statement;"); break; } } } /* * Expected output Help on: 1. if 2. switch 3. while 4. do-while 5. for Choose one: 4 The do-while do{ statement; }while(condition); */

@Jeanne Boyarsky

Gotchya! Thanks for clarifying that When I apply the edits,I think it goes into an infinite loop...since its not producing any output...unless I am doing something wrong :\



===========================================================================================
@Debdeep Ganguly

Yes! The code works with the suggested ammendment! Although I do not get the expected results

-------------------------------
Expected output

Help on:
1. if
2. switch
3. while
4. do-while
5. for
Choose one:
4
The do-while
do{
statement;
}while(condition);

--------------------------------------
Output after suggested ammendment

Help on:
if:
switch:
while:
do - while:
for
:
choose one:

package Operators; import java.*; public class Menu { //private Exception IOException; public static void main(String[] args ) { throw io.IOException;{ char choice; int i, j, k; do { System.out.println("Help on: "); System.out.println("if: "); System.out.println("switch: "); System.out.println("while: "); System.out.println("do - while: "); System.out.println("for\n: "); System.out.println("choose one: "); choice = (char) System.in.read(); }while (choice < '1' || choice > '5'); System.out.println("\n"); switch(choice){ case '1': System.out.println("The if:\n"); System.out.println("if (condition) statement;"); System.out.println("else statement"); break; case '2': System.out.println("The switch:\n"); System.out.println("switch (expression) {"); System.out.println(" case constant:"); System.out.println(" statement sequence"); System.out.println(" break;"); System.out.println(" //..."); System.out.println("}"); break; case '3': System.out.println("The while:\n"); System.out.println("while(condition) statement"); break; case '4': System.out.println("The do while:\n"); System.out.println("do {"); System.out.println(" statement;"); System.out.println("} while (condition);"); case '5': System.out.println("The for:\n"); System.out.println("for (init; condition; iteration)"); System.out.println("statement"); break; } } } }



I am trying to run this code but I am getting error in line "throw io.IOException;"(line 11) I have downloaded the TextIO file...I am not sure how to debug this,
Any help will be greatly appreciated ^.^

Thanks Jeane

Hi Norm,

public class HexByte {

public static void main(String[] args) {

char hex [] = {'0','1','2','3','4','5','6','7','8','9',
'a','b','c','d','e','f' };
byte b = (byte) 0xf1;

System.out.println("b = 0x" + hex[(b>>4) & 0x0f] + hex[b & 0x0f] );

}

}

I have worked out hex[(b>>4) & 0x0f] + hex[b & 0x0f] to be hex[15] + hex[1] but I have no idea how will hex[15] + hex[1] works out D:

Hi,
So I am currently trying to solve

hex[(b>>4) & 0x0f] + hex[b & 0x0f]

and I have worked it out until hex[15] + hex [1], But I dont know how to proceed from there...because, say the "hex" part wasnt there in the expression, wouldnt 15+1, considering they were decimals and we did not have to convert, be 16, which would be 0x10? D:

Then why does the console window give me an output of 0xf1..unless I am making a mistake in working it out...

Any help or contribution will be greatly appreciated. Thanks.