Octal to Binary Conversion

/* C++ Program to Convert Octal Number to Binary Number */  
#include<bits/stdc++.h>  
using namespace std;  
int main()  
{  
    /* Scan the Octal Number */  
    int Octal;  
    cout<<"Enter the Octal Number: ";  
    cin>>Octal;  
      
    /* Converting Octal to Binary*/  
    string Binary;  
    int temp = Octal;  
    while(temp != 0)  
    {  
        int remainder = temp % 10;  
        string val;  
          
        /* Binary equivalent of each digit */  
        switch(remainder) {  
            case 0: val = "000";  
            break;  
            case 1: val = "001";  
            break;  
            case 2: val = "010";  
            break;  
            case 3: val = "011";  
            break;  
            case 4: val = "100";  
            break;  
            case 5: val = "101";  
            break;  
            case 6: val = "110";  
            break;  
            case 7: val = "111";  
            break;  
            case 8: val = "1000";  
            break;  
            case 9: val = "1001";  
            break;  
        }  
          
        Binary = val + Binary ;  
        temp = temp / 10;  
    }  
      
    /*Deleting the extra zeros from front*/  
    while(Binary[0]!='1')  
    {  
        Binary.erase(Binary.begin()+0);  
    }  
      
    /*Printing the result */  
    cout<<"The Binary of "<<Octal<<" is "<<Binary;  
}