Converting binary to decimal using recursion

[trinibaby]

Hi,
I'm having some trouble with my code that convert binary to decimal using recursion. this is my code

#include <cstdlib>
#include <iostream>
using namespace std;
void binaryToDecimal( int binaryNumber, int decimal, int weight );
int main(int argc, char *argv[])
{
   // binary to decimal 
    int decimalNum;
    int bitWeight;
    int binaryNum;
    decimalNum = 0;
    bitWeight = 0;
    cout <<"enter a number in binary: ";
    cin >> binaryNum;
    cout << endl;
    binaryToDecimal(binaryNum, decimalNum, bitWeight);
    cout << "Binary" << binaryNum << "=" << decimalNum
         <<"decimal" << endl;

    system("PAUSE");
    return EXIT_SUCCESS;
}

void binaryToDecimal( int binaryNumber, int decimal, int weight )
{
     int bit;
     if ( binaryNumber > 0 )
     bit = binaryNumber % 10;
     decimal = decimal + bit * pow(2, weight );
     binaryNumber = binaryNumber / 10;
     weight++;
     binaryToDecimal(binaryNumber, decimal, weight );
}

my teacher said that i have to do the following errors, but I have no idea how to fix it..

1 - the binaryNumber variable should be a string, not an int, example: "110110"
2 - the function should return an int, the binary string converted to a decimal number
3 - your function never returns, i.e. never stops, that is the cause of the crash

Can someone please help me.
thanks,:)

[WaltP]

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[softeng2013]

//edit code of binary to decimal conversion(using recursive function)
//try it,,,its working

#include <iostream>
#include <math.h>

int sum=0;
using namespace std;
int binaryToDecimal( int binaryNumber, int weight );
int main()
{
// binary to decimal

int bitWeight;
int binaryNum;
bitWeight = 0;
cout <<"enter a number in binary: ";
cin >> binaryNum;
cout << endl;
int sum=binaryToDecimal(binaryNum, bitWeight);
cout << "Binary " << binaryNum << "= "<< sum<< endl;

system("PAUSE");
return 0;
}

int binaryToDecimal( int binaryNumber, int weight )
{
int bit;
if ( binaryNumber> 0 ){
bit = binaryNumber % 10;
sum = sum + bit * pow(2, weight );
binaryNumber = binaryNumber / 10;
weight++;
binaryToDecimal(binaryNumber, weight );}
return sum;
}

[softeng2013]

Hi,
I'm having some trouble with my code that convert binary to decimal using recursion. this is my code

#include <cstdlib>
#include <iostream>
using namespace std;
void binaryToDecimal( int binaryNumber, int decimal, int weight );
int main(int argc, char *argv[])
{
   // binary to decimal 
    int decimalNum;
    int bitWeight;
    int binaryNum;
    decimalNum = 0;
    bitWeight = 0;
    cout <<"enter a number in binary: ";
    cin >> binaryNum;
    cout << endl;
    binaryToDecimal(binaryNum, decimalNum, bitWeight);
    cout << "Binary" << binaryNum << "=" << decimalNum
         <<"decimal" << endl;

    system("PAUSE");
    return EXIT_SUCCESS;
}

void binaryToDecimal( int binaryNumber, int decimal, int weight )
{
     int bit;
     if ( binaryNumber > 0 )
     bit = binaryNumber % 10;
     decimal = decimal + bit * pow(2, weight );
     binaryNumber = binaryNumber / 10;
     weight++;
     binaryToDecimal(binaryNumber, decimal, weight );
}

my teacher said that i have to do the following errors, but I have no idea how to fix it..
1) the binaryNumber variable should be a string, not an int
example: "110110"
2) the function should return an int, the binary string converted to a decimal number
3) your function never returns, i.e. never stops, that is the cause of the crash

Can someone please help me.
thanks,:)

see below..i have modify your code..now its working...just copy and paste..and enjoy it...dont forget to reply..

[Mr. K]

Did you find any error? What type of error did you get?

#include <iostream>
#include <math.h>

int sum = 0;
using namespace std;
int binaryToDecimal( int binaryNumber, int weight );
int main()
{
// binary to decimal

int bitWeight;
int binaryNum;
bitWeight = 0;
cout <<"enter a number in binary: ";
cin >> binaryNum;
cout << endl;
int sum = binaryToDecimal(binaryNum, bitWeight);
cout << "Binary " << binaryNum << "= "<< sum<< endl;

system("PAUSE");
return 0;
}

int binaryToDecimal( int binaryNumber, int weight )
{
int bit;
if ( binaryNumber > 0 ){
bit = binaryNumber % 10;
sum = sum + bit * pow(2, weight );
binaryNumber = binaryNumber / 10;
weight++;
binaryToDecimal(binaryNumber, weight );
}
return sum;
}

[great_learner]

There is one mistake in code mentioned by Mr. K. In BinaryToDecimal function, sum should be static variable else value will not be retained. You are adding to a garbage value.

So I think it should be:

  int binaryToDecimal( int binaryNumber, int weight )
    {
    int bit;
    static int sum = 0;
    if ( binaryNumber > 0 ){
    bit = binaryNumber % 10;
    sum = sum + bit * pow(2, weight );
    .
    .
    .
    .
    }