CPP Program convert decimal to octal

 In this example, you will learn about the conversion of decimal to octal number in the CPP programming language.

For understanding the program you have the knowledge about the following topic.

while loop

input method

output method

Code:

#include <iostream>

#include <cmath>

using namespace std;

int main()

{

   int decimalNumber,original;

   cout << "Enter a decimal number ";

   cin >> decimalNumber;

  original=decimalNumber;

    int remainder, i = 1, octalNumber = 0;

    while (decimalNumber != 0)

    {

        remainder = decimalNumber % 8;

        decimalNumber /= 8;

        octalNumber += remainder * i;

        i *= 10;

    }

     

     cout << original << " in decimal  =  " << octalNumber << "  in octal "<<endl;

   return 0;

}

Output:

Enter a decimal number 6789

6789 in decimal  =  15205  in octal

In the above code, while loop is used to convert the decimal number, separate the number by modulus 8, divide by 8 to decrease the one digit, and multiple by the power of 10 with unit place by using a power function. At the end of the loop, add in the decimal number. In this way, loop iterate in order to convert the whole number.

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