Convert Binary Number to Octal and vice-versa. C++

#cpp #numbers

C++

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#include <iostream>
#include <cmath>
​
using namespace std;
​
int convertBinarytoOctal(long long);
int main()
{
    long long binaryNumber;
​
    cout << "Enter a binary number: ";
    cin >> binaryNumber;
​
    cout << binaryNumber << " in binary = " << convertBinarytoOctal(binaryNumber) << " in octal ";
​
    return 0;
}
​
int convertBinarytoOctal(long long binaryNumber)
{
    int octalNumber = 0, decimalNumber = 0, i = 0;
​
    while(binaryNumber != 0)
    {
        decimalNumber += (binaryNumber%10) * pow(2,i);
        ++i;
        binaryNumber/=10;
    }
​
    i = 1;
​
    while (decimalNumber != 0)
    {
        octalNumber += (decimalNumber % 8) * i;
        decimalNumber /= 8;
        i *= 10;
    }
​
    return octalNumber;
}

Output result

Enter a binary number: 10001
10001 in binary = 21 in octal

C++

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Convert Binary Number to Octal and vice-versa. C++

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