# C++ program to convert binary number to octal number using class

Submitted by Shubh Pachori, on August 08, 2022

## Problem statement

Given a binary number, we have to convert it to octal number using the class and object approach.

Example:

```Input:
Enter Binary: 10101

Output:
Octal Number: 25
```

## C++ code to convert binary number to octal number using class and object approach

```#include <iostream>
#include <cmath>
using namespace std;

// create a class
class BinaryToOctal {
// private data member
private:
long binary;

// public functions
public:
// getBinary() function to get binary digit
void getBinary() {
cout << "Enter Binary:";

cin >> binary;
}

// BToO() function to convert binary to octal
int BToO() {
// declaring int type variables for operations
int octal = 0, decimal = 0, index = 0;

// while to convert binary to decimal
while (binary != 0)

{
decimal = decimal + (binary % 10) * pow(2, index);

index++;

binary = binary / 10;
}

index = 1;

// while loop to convert decimal to octal
while (decimal != 0)

{
octal = octal + (decimal % 8) * index;

decimal = decimal / 8;

index = index * 10;
}

// returning the converted value
return octal;
}
};

int main() {
// create a object
BinaryToOctal B;

// initialize a int type variable to store the value
int o;

// calling getBinary() function to insert the binary digit
B.getBinary();

// calling BToO() function to convert it
o = B.BToO();

cout << "Octal Number:" << o;

return 0;
}
```

### Output

```Enter Binary: 11001
Octal Number: 31
```

### Explanation

In the above code, we have created a class BinaryToOctal, one long type data member binary to store the binary digit, and public member functions getBinary() and BToO() to store and convert the given binary digit to octal number.

In the main() function, we are creating an object B of class BinaryToOctal, reading the binary digit given by the user using getBinary() function, and finally calling the BToO() member function to convert the given binary digit. The BToO() function contains the logic to convert the given binary digit and printing the result.

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