Convert Binary to Decimal and from Decimal to Binary
 

Hi, I have a program problem with converting decimals to binary and back again. My teacher said that the program is to be like a menu and convert decimals or binary from the user's input. This is part of my code:

#include <iostream>

#include <string>



using namespace std;



void binary(int number) {

     int remainder;

     if(number <= 1)

     cout << number;

     remainder = number % 2;

     binary(number >> 1);

     cout << remainder;

}



int main(){

    

    int number;

    int choice;

    

    cout << "1. Binary to Decimal\n";

    cout << "2. Decimal to Binary\n";

    cout << "3. Quit Program\n";

    cout << "Enter your Choice: ";

    cin >> choice;

    

    switch (choice) {

           

           case '1':

                cout << "Please enter an integer: ";

                cin >> number;

                if (number < 0)

                        cout << "Error enter positive integer: ";

                else {

                     cout << "The number in Binary is: ";

                     binary(number);

                     cout << endl;

                }





}

system("pause");

return 0;

}

I know my problem is with the binary(int number) function because it is runnable but dosen't call to the function. So, my question is how can I modify this to run correctly? Also, how would I go about reversing the code to have it convert binary to decimal?

Re: Convert Binary to Decimal and from Decimal to Binary
 

Nice thought to use the recursive function...

recursive function should have the terminating point which in the conversion always turn to 1 at last.

void binary(int num)

{

  if(num!=1) 

  {

    int rem=num%2;

    binary(num/2);

    cout<<rem;

  } 

  else

  cout<<num;

}

Re: Convert Binary to Decimal and from Decimal to Binary
 

Thanks Rohitman. So, How do I reverse it as in binary to decimal? I know it has something to do with diffrent powers of a number like 2x^i. So, do I use a for loop for that or something else?

Re: Convert Binary to Decimal and from Decimal to Binary
 

1 = 1
10 = 2
100 = 4
1000 = 8

You can solve this in more than one way, well I can think of multiple ways atleast ^^
Hope this helps

Re: Convert Binary to Decimal and from Decimal to Binary
 

yes, you have to do some thing like that only. It your wish to use the recursive function or not but I don't recommend to use the recursive function in this case and earlier one too.

In any number system is represented by the general expression
a[n]*r^[n] + a[n-1]*r^[n-1] +........+ a[2]*r^[2] + a[1]*r^[1]+a[0] //integer part
+ a[-1]*r^[-1] + + a[-1]*r^[-2].......+ a[-m]*r^[-m] //fraction part

where,
a[j] is the coefficient
r is radix or base

For decimal no system r = 10; and coefficient can have the value from 0-9

Similarly the binary no system base will be 2, and can have only 2 values 0 and 1.

I guess concept would be clear...
best of luck for programming..

Re: Convert Binary to Decimal and from Decimal to Binary
 

Thanks, I think I got it. I finally got additional help from one of my friends in class.