Input/Output Problems

[ttoboobz]

Very new to Programming, need help...

I need codes that would make a user to try again if they inputed a wrong value...
the program that I am making will ask the user to enter two positive integer, then the program will compute the greatest common divisor of the two integer. I used JOptionPane as the interface to the user. I already have an idea on how to get the GCD, that my problem is only on How to make the program go back to asking the user if they inputed a wrong value, let us say, a negative integer, or a String, or character. Here's what I have done so far:

import javax.swing.JOp tionPane;

public class GreatestCommonD ivisor {

public static void main(String[] args) {

String s1 = JOptionPane.sho wInputDialog(nu ll,"Enter an integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);
int num1 = Integer.parseIn t(s1);
String s2 = JOptionPane.sho wInputDialog(nu ll,"Enter another integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);

int num2 = Integer.parseIn t(s2);
int gcd = 1;
int k = 1;
int x=num1;
int divisor[] = new int[num1+1];

System.out.prin tln("");
System.out.prin tln("The divisors of "+num1+" that do not divide "+num2+" are:");
System.out.prin tln("");

while(x>=1)
{
divisor[x] = x;
if(num1%x==0 && num2%x!=0)
System.out.prin tln(" "+divisor[x]);
x--;
}


while(k<=num1 && k<=num2)
{
if(num1%k==0 && num2%k==0)
gcd = k;
k++;
}

System.out.prin tln("");
System.out.prin tln("The GCD of "+num1+" and "+num2+" is "+gcd);
System.out.prin tln("");
}

}

[pranjalsingh]

Very new to Programming, need help...

I need codes that would make a user to try again if they inputed a wrong value...
the program that I am making will ask the user to enter two positive integer, then the program will compute the greatest common divisor of the two integer. I used JOptionPane as the interface to the user. I already have an idea on how to get the GCD, that my problem is only on How to make the program go back to asking the user if they inputed a wrong value, let us say, a negative integer, or a String, or character. Here's what I have done so far:

import javax.swing.JOp tionPane;

public class GreatestCommonD ivisor {

public static void main(String[] args) {

String s1 = JOptionPane.sho wInputDialog(nu ll,"Enter an integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);
int num1 = Integer.parseIn t(s1);
String s2 = JOptionPane.sho wInputDialog(nu ll,"Enter another integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);

int num2 = Integer.parseIn t(s2);
int gcd = 1;
int k = 1;
int x=num1;
int divisor[] = new int[num1+1];

System.out.prin tln("");
System.out.prin tln("The divisors of "+num1+" that do not divide "+num2+" are:");
System.out.prin tln("");

while(x>=1)
{
divisor[x] = x;
if(num1%x==0 && num2%x!=0)
System.out.prin tln(" "+divisor[x]);
x--;
}


while(k<=num1 && k<=num2)
{
if(num1%k==0 && num2%k==0)
gcd = k;
k++;
}

System.out.prin tln("");
System.out.prin tln("The GCD of "+num1+" and "+num2+" is "+gcd);
System.out.prin tln("");
}

}

Hi,
I've did the changes, now it should work perfectly whatever problem u've. So Check that & enjoy...

public class GreatestCommonD ivisor {

public static void main(String[] args) {
A:
try
{
String s1 = JOptionPane.sho wInputDialog(nu ll,"Enter an integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);
int num1 = Integer.parseIn t(s1);
String s2 = JOptionPane.sho wInputDialog(nu ll,"Enter another integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);

int num2 = Integer.parseIn t(s2);
if(num1<=0 or num2<=0)
throw new Exception("Exce ption");
}catch(Exceptio n e)
{
continue A;
}
int gcd = 1;
int k = 1;
int x=num1;
int divisor[] = new int[num1+1];

System.out.prin tln("");
System.out.prin tln("The divisors of "+num1+" that do not divide "+num2+" are:");
System.out.prin tln("");

while(x>=1)
{
divisor[x] = x;
if(num1%x==0 && num2%x!=0)
System.out.prin tln(" "+divisor[x]);
x--;
}


while(k<=num1 && k<=num2)
{
if(num1%k==0 && num2%k==0)
gcd = k;
k++;
}

System.out.prin tln("");
System.out.prin tln("The GCD of "+num1+" and "+num2+" is "+gcd);
System.out.prin tln("");
}

}

[r035198x]

Very new to Programming, need help...

I need codes that would make a user to try again if they inputed a wrong value...
the program that I am making will ask the user to enter two positive integer, then the program will compute the greatest common divisor of the two integer. I used JOptionPane as the interface to the user. I already have an idea on how to get the GCD, that my problem is only on How to make the program go back to asking the user if they inputed a wrong value, let us say, a negative integer, or a String, or character. Here's what I have done so far:

import javax.swing.JOp tionPane;

public class GreatestCommonD ivisor {

public static void main(String[] args) {

String s1 = JOptionPane.sho wInputDialog(nu ll,"Enter an integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);
int num1 = Integer.parseIn t(s1);
String s2 = JOptionPane.sho wInputDialog(nu ll,"Enter another integer","Probl em 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);

int num2 = Integer.parseIn t(s2);
int gcd = 1;
int k = 1;
int x=num1;
int divisor[] = new int[num1+1];

System.out.prin tln("");
System.out.prin tln("The divisors of "+num1+" that do not divide "+num2+" are:");
System.out.prin tln("");

while(x>=1)
{
divisor[x] = x;
if(num1%x==0 && num2%x!=0)
System.out.prin tln(" "+divisor[x]);
x--;
}


while(k<=num1 && k<=num2)
{
if(num1%k==0 && num2%k==0)
gcd = k;
k++;
}

System.out.prin tln("");
System.out.prin tln("The GCD of "+num1+" and "+num2+" is "+gcd);
System.out.prin tln("");
}

}

Please use code tags next time when posting code.
You can use exception handling:

boolean valid = false;
while(!valid) {
String s1 = JOptionPane.showInputDialog(null,"Enter an intege");
 try {
     int num = Integer.parseInt(s1);
     if(num > 0) {
          valid = true;
     }
 }
 catch(NumberFormatException nFE) {

 }
}

[arivazhaganit]

/* new way of Coding with exception for above mentioned problem */

import javax.swing.JOp tionPane;
public class GreatestCommonD ivisor {

public static void main(String[] args) {
find(getInput(1 ),getInput(2)); }

static void find(int num1,int num2)
{
int gcd = 1;
int k = 1;
while(k<=num1 && k<=num2)
{
if(num1%k==0 && num2%k==0)
gcd = k;
k++;
}
JOptionPane.sho wMessageDialog( null,"The GCD of "+num1+" and "+num2+" is "+gcd);
}

static int getInput(int cnt)
{
int num=0;
try{
String s = JOptionPane.sho wInputDialog(nu ll,"Enter Integer "+cnt,"Prob lem 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);
num = Integer.parseIn t(s);
if(num<0) throw new Exception("Neag ative Number");
} catch(Exception e){ JOptionPane.sho wMessageDialog( null,e);return getInput(cnt);}
return num;
}
}

[r035198x]

/* new way of Coding with exception for above mentioned problem */

import javax.swing.JOp tionPane;
public class GreatestCommonD ivisor {

public static void main(String[] args) {
find(getInput(1 ),getInput(2)); }

static void find(int num1,int num2)
{
int gcd = 1;
int k = 1;
while(k<=num1 && k<=num2)
{
if(num1%k==0 && num2%k==0)
gcd = k;
k++;
}
JOptionPane.sho wMessageDialog( null,"The GCD of "+num1+" and "+num2+" is "+gcd);
}

static int getInput(int cnt)
{
int num=0;
try{
String s = JOptionPane.sho wInputDialog(nu ll,"Enter Integer "+cnt,"Prob lem 1: Greatest Common Divisor Input", JOptionPane.QUE STION_MESSAGE);
num = Integer.parseIn t(s);
if(num<0) throw new Exception("Neag ative Number");
} catch(Exception e){ JOptionPane.sho wMessageDialog( null,e);return getInput(cnt);}
return num;
}
}

The code tags are where you have the # sign just above the textarea you post in.
I would not have to make a function just for taking in input for this simple program and I would certainly not use recursion for that input function

[arivazhaganit]

hi r035198x ;

There are some errors in your coding, their is no continue variable in java with out using loop.

logically it will make problem , whenever you enter a wrong value ,again you have to repeat to get two values instead of giving only a value for wrong one.

[r035198x]

hi r035198x ;

There are some errors in your coding, their is no continue variable in java with out using loop.

logically it will make problem , whenever you enter a wrong value ,again you have to repeat to get two values instead of giving only a value for wrong one.

Sorry but you must be mistaken. I posted my code in reply #3. You will not find a continue there. Personally I always avoid using break and continue if I can help it. You must have mistaken someone else's code for mine.

[arivazhaganit]

hi r035198x ...

I'm very sorry , I mistaken some one coding as your coding , plz forgive me...

with regards
Arivu

[r035198x]

hi r035198x ...

I'm very sorry , I mistaken some one coding as your coding , plz forgive me...

with regards
Arivu

Get over it.
We all make mistakes everyday. I was not offended.