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Using loops with the String and Character classes. You can also use the StringBuilder class to concatenate all the error mess
Write a class definition file that has a string field to hold a possible floating point number. Name this class Validate Flo
If the code does not compile the grade is a zero. documentation- Javadoc, inline comments, conventions, proper use of white s
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Answer #1

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ValidateFloat.java
1. 2. import java.util.*; import java.lang.StringBuilder; class ValidateFloat 3. 4. 5. boolean isvalid (String var, StringBui

import java.util.*;

import java.lang.StringBuilder;

class ValidateFloat

{

boolean isvalid(String var,StringBuilder err)

{

boolean validc=true;

int dptcnt=0;

int ecnt=0;

int signcnt=0;

boolean result=true;

for(int i=0;i<var.length();i+=1)

{

if(!((('0'<=var.charAt(i)) && (var.charAt(i)<='9')) || (var.charAt(i)=='E') || (var.charAt(i)=='.') || (var.charAt(i)=='+') || (var.charAt(i)=='-')))

{

validc=false;

}

if(var.charAt(i)=='E')

ecnt+=1;

if(var.charAt(i)=='.')

dptcnt+=1;

if(var.charAt(i)=='+' || var.charAt(i)=='-')

signcnt+=1;

}

if(validc==false)

{

result=result && false;

err.append("Conatins Invalid characters\n");

}

if(ecnt>1)

{

result=result && false;

err.append("E occurs more than once\n");

}

if(dptcnt>1)

{

result=result && false;

err.append("Decimal Point occurs more than once\n");

}

if(signcnt>2)

{

result=result && false;

err.append("'+' and '-' are more than twice");

}


return result;

}

}
Main.java
{ { 1. import java.util.*; 2. import java.lang.StringBuilder; 3. class Main 4. { 5. public static void main(String[] args) 6.

import java.util.*;

import java.lang.StringBuilder;

class Main

{

public static void main(String[] args)

{

Scanner sc=new Scanner(System.in);

ValidateFloat cl1=new ValidateFloat();

while(true)

{

String var=sc.nextLine();

if(var.equals("quit"))

{

break;

}

StringBuilder err=new StringBuilder();

boolean result=cl1.isvalid(var, err);

if(result)

System.out.println(var+" is a valid Floating Point Number.\n");

else

System.out.println(var+" is not a valid Floating Point Number, because\n"+err);

}

}

}
Output

3.14159
3.14159 is a valid Floating Point Number.

-2.54
-2.54 is a valid Floating Point Number.

2.453E3
2.453E3 is a valid Floating Point Number.

66.3E-5
66.3E-5 is a valid Floating Point Number.

3.a134
3.a134 is not a valid Floating Point Number, because
Conatins Invalid characters

-2.5.4
-2.5.4 is not a valid Floating Point Number, because
Decimal Point occurs more than once

2.45E3E
2.45E3E is not a valid Floating Point Number, because
E occurs more than once

-3.45-34E+5
-3.45-34E+5 is not a valid Floating Point Number, because
'+' and '-' are more than twice
-2w..AEE+-1123
-2w..AEE+-1123 is not a valid Floating Point Number, because
Conatins Invalid characters
E occurs more than once
Decimal Point occurs more than once
'+' and '-' are more than twice
quit
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