asked on

How to create a java program that generates and prints a random phone number in the form xxx-xxx-xxxx

Thats basically what i need to know in a nutshell.....
these are the parameters
-The first digit can't be a zero
-The first 3 digits can't contain an 8 or 9
-the second set of 3 digits cant begin with a zero
-the second set of 3 digits cant be greater than 610
-The first digit of the last set of digits cant be a zero

(ultimately i need it written in java form)

zzynx

What do you have already?

zzynx

We're not here to write a complete programs for you. (Lots of other sites exist for that)
We're here to help you with problems you might have when writing your program

zzynx

Use java.util.Random.nextInt() to generate the parts of your telephone number

ASKER CERTIFIED SOLUTION

zzynx

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zzynx

Typo:

tmp = digits[ rd.nextInt(10) ];

should be

tmp = digits[ rd.nextInt(8) ]; // since 8 and 9 shouldn't be "picked"

zzynx

Or easier:

StringBuffer telephoneNr = new StringBuffer();
Random rd = new Random();

// Generate first part
String tmp;
do {
tmp = "" + (100 + rd.nextInt(900));
} while ( tmp.indexOf("8")!=-1 || tmp.indexOf("9")!=-1 );
telephoneNr.append(tmp);

telephoneNr.append("-");

// Generate 2nd part
tmp = "" + (100 + rd.nextInt(511));
telephoneNr.append(tmp);

telephoneNr.append("-");

// Generate 3rd part
tmp = "" + (1000 + rd.nextInt(9000));
telephoneNr.append(tmp);

System.out.println( telephoneNr.toString() );

shah1d1698

Try this code.. Compile & run the program.

public class Application1
{

String finalString = null;
public void generateNumber()
{
int p1 = 0, p2 = 0, p3 = 0;
String s1 = null, s2 = null, s3 = null;

while(true)
{
p1 = (int) (Math.random() * 1000);
String temp = "" + p1;
int tempFlag = 0;
for(int i = 0; i < temp.length();i ++)
{
if(temp.charAt(i) == '8' || temp.charAt(i) == '9')
{
tempFlag = 1;
}
}
if(p1 > 100 && tempFlag == 0)
break;
}

finalString = "" + p1;

while(true)
{
p2 = (int) (Math.random() * 1000);
if(p2 > 100 && p2 < 610)
break;
}

finalString = finalString + "-" + p2;

while(true)
{
p3 = (int) (Math.random() * 10000);
if(p3 > 1000)
break;
}

finalString = finalString + "-" + p3;

System.out.println(finalString);

}

public static void main(String args[])
{
Application1 app = new Application1();
for(int i = 0; i < 1000; i++) // this will generate 1000 numbers..
{
app.generateNumber();
}
}
}