برنامه تبدیل عدد از مبنای 8 به 10 یا Octal به decimal و بلعکس به زبان سی پلاس پلاس

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/* C++ programming source code to convert either octal to decimal or decimal to octal according to data entered by user. */

#include <iostream>
#include <cmath>
using namespace std;
int decimal_octal(int n);
int octal_decimal(int n);
int main()
{
   int n;
   char c;
   cout << "Instructions: " << endl;
   cout << "1. Enter alphabet 'o' to convert decimal to octal." << endl;
   cout << "2. Enter alphabet 'd' to convert octal to decimal." << endl;
   cin >> c;
   if (c =='d' || c == 'D')
   {
       cout << "Enter a octal number: ";
       cin >> n;
       cout << n << " in octal = " << octal_decimal(n) << " in decimal";
   }
   if (c =='o' || c == 'O')
   {
       cout << "Enter a decimal number: ";
       cin >> n;
       cout << n << " in decimal = " << decimal_octal(n) << " in octal";
   }
   return 0;
}

int decimal_octal(int n) /* Function to convert decimal to octal */
{
    int rem, i=1, octal=0;
    while (n!=0)
    {
        rem=n%8;
        n/=8;
        octal+=rem*i;
        i*=10;
    }
    return octal;
}

int octal_decimal(int n) /* Function to convert octal to decimal */
{
    int decimal=0, i=0, rem;
    while (n!=0)
    {
        rem = n%10;
        n/=10;
        decimal += rem*pow(8,i);
        ++i;
    }
    return decimal;
}

Output

Instructions:
1. Enter alphabet 'o' to convert decimal to octal.
2.  Enter alphabet 'd' to convert octal to decimal.
d
Enter an octal number: 2341
2341 in octal = 1249 in decimal