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Jan 10th, 2009

Converting digits..need help!

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Hi everyone!I've started to learn C++ couple of months ago and having some trouble with the code i'm trying the write.. I have to write a function that converts every digit of the parameter to zero,except 2.And number of digits is unknown..
I made this but its's output is always 0.Even i enter a number that contains 2...I'll be glad if you could help..Thanks

C++ Syntax (Toggle Plain Text)
#include<iostream>
using namespace std;
 
int convertNum(int n){
 
int digits=0;
int remainder;
 
for(int i=n;n!=0;n/=10)
digits=digits+1;
 
for(int j=1;j<=digits;j++){
n=n/10;
remainder=n%10;
if(remainder==2)
  remainder=2;
if(remainder!=2)
  remainder=0;
 
}
 
return remainder;
 
}
 
int main()
{
 int a;
 
 cout<<"Please enter a positive integer"<<endl;
 cin>>a;
 
cout<<"The converted version of "<<a<<" is ----> "<<convertNum(a);
 
return 0;
}
#include<iostream>
using namespace std;

int convertNum(int n){

int digits=0;
int remainder;

for(int i=n;n!=0;n/=10)
digits=digits+1;

for(int j=1;j<=digits;j++){
n=n/10;
remainder=n%10;
if(remainder==2)
  remainder=2;
if(remainder!=2)
  remainder=0;

}

return remainder;

}

int main()
{
 int a;

 cout<<"Please enter a positive integer"<<endl;
 cin>>a;

cout<<"The converted version of "<<a<<" is ----> "<<convertNum(a);
 
return 0;
}

Last edited by Ancient Dragon; Jan 10th, 2009 at 9:23 am. Reason: add code tags

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winry

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Jan 10th, 2009

Re: Converting digits..need help!

I'd be glad if you could read all the intro threads which describe how to post code.

Salem

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Posting Sage

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Jan 10th, 2009

Re: Converting digits..need help!

What I could get out of your unformatted code was
if(remainder==2)
remainder=2;
if(remainder!=2)
remainder=0;
should be better :
if(remainder==2)
remainder=2;leave this away-->if it IS 2 why set it to 2 ?
if(remainder!=2) remainder=0;-->+-OK, because if you want to print 2 it will print 0

ddanbe

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Jan 10th, 2009

Re: Converting digits..need help!

Lines 11,12. n is 0 after them and also i don't get why u use for not while and why u need that int i

da penguin

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Jan 10th, 2009

Re: Converting digits..need help!

ok,thanks for your help..
i'll fix it..

winry

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Jan 10th, 2009

Re: Converting digits..need help!

You say that you don't know the exact number of digits.
Then why not he input to the function be a string
such that

C++ Syntax (Toggle Plain Text)
 
string convertNum(string num)
{
 //1.set counter to 0
 //2.Check if it is the end of the string(using counter's position).
 // 3.if yes goto goto step 4 
 //   else check if the character in the string is other than 2 
//    if yes, fill  a zero in the string
//increment the counter
// goto step 2 
//4.Display or return your string
 
}
string convertNum(string num)
{
 //1.set counter to 0
 //2.Check if it is the end of the string(using counter's position).
 // 3.if yes goto goto step 4 
 //   else check if the character in the string is other than 2 
//    if yes, fill  a zero in the string
//increment the counter
// goto step 2 
//4.Display or return your string

}

Hope that i am not twisting the question.

zalezog

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Jan 10th, 2009

Re: Converting digits..need help!

Thank you so much zalezog..I've made it

..I used string and it's way much easier...

winry

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