Decimal to Octal Conversion

“Decimal to Octal Conversion” is one of the classic programming problem exercise. Here, we are given a decimal number, entered by user and our task is to convert the given decimal number to its equivalent octal number.

Example:

88 -> 130
78 -> 116

The steps to convert the decimal number to octal number are as follows:

1. Take Octal = 0, iterator = 1.
2. Store the remainder when the decimal number is divided by 8.
3. Divide the decimal number by 8.
4. Octal = Octal + iterator * remainder.
5. Multiply the iterator by 10.
6. Repeat the steps from 2 to 5 until decimal number is not 0.
7. Print the Octal Number. 

C++ Program to convert Decimal to Octal Number is as follows:

/* C++ Program to Convert Decimal Number to Octal Number */  
#include<bits/stdc++.h>  
using namespace std;  
int main()  
{  
    /* Scan the Decimal Number */  
    int Decimal;  
    cout<<"Enter the Decimal Number: ";  
    cin>>Decimal;  
      
    /* Converting Decimal to Octal */  
    int Octal = 0;  
    int iterator = 1;  
    int temp = Decimal;  
    while(temp != 0)  
    {  
        int remainder = temp % 8;  
        temp = temp / 8;  
        Octal = Octal + remainder*iterator;  
        iterator = iterator * 10;  
    }  
      
    /*Printing the result */  
    cout<<"The Octal of "<<Decimal<<" is "<<Octal;  
}  

OUTPUT:
Enter the Decimal Number: 78
The Octal of 78 is 116

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