Octal to Hexadecimal Conversion

/* C++ Program for Octal to Hexadecimal Conversion */  
#include<bits/stdc++.h>  
using namespace std;  
int bin2Dec(string binary)  
{  
    int decimal = 0;    
    int iterator = 3;     
    for(int i = 0; i < 4; i++)    
    {  
          
        char digit = binary[i];  
        if(digit == '1')  
        decimal = decimal + (1 * pow(2,iterator)); /* Putting it into formula */    
        iterator--;    
    }    
    return decimal;    
}  
int main()  
{  
    /* Scan the Octal Number */  
    string Octal;  
    cout<<"Enter the Octal Number: ";  
    cin>>Octal;  
      
    /* Converting Octal to hexadecimal*/  
    string octal_binary;  
    /* Converting each digit of octal number 
       to 3-digit binary number and store the  
       combined result into 'octal_binary'  
    */  
    for(int i = 0; i < Octal.length(); i++)  
    {  
        string temp;  
        switch(Octal[i])  
        {  
            case '0': temp = "000";  
            break;  
            case '1': temp = "001";  
            break;  
            case '2': temp = "010";  
            break;  
            case '3': temp = "011";  
            break;  
            case '4': temp = "100";  
            break;  
            case '5': temp = "101";  
            break;  
            case '6': temp = "110";  
            break;  
            case '7': temp = "111";  
            break;  
        }  
        /* Combining the 3-digit binary numbers */  
        octal_binary = octal_binary + temp;  
    }  
      
    /* Length of 'octal_binary' must be multiple of 4 */  
    if(octal_binary.length() % 4 != 0)  
    {  
        /* Inserting Extra 0s, if needed */  
        while(octal_binary.length() % 4 != 0)  
        {  
            octal_binary.insert(0,"0");  
        }  
    }  
      
    /* Distribute 'octal_binary' into pairs of 4-digit, 
       convert them into decimal equivalent and then  
       Hexadecimal equivalent 
    */  
    string Hexadecimal;  
    for(int i = 0; i < octal_binary.length(); i=i+4)  
    {  
        string temp = "";  
        temp+= octal_binary[i];  
        temp+= octal_binary[i+1];  
        temp+= octal_binary[i+2];  
        temp+= octal_binary[i+3];  
        /* Converting 'temp' into decimal */  
        int decimal = bin2Dec(temp);  
        /* Converting decimal to corresponding Hexadecimal */  
        switch(decimal) {  
            case 0 :   
                Hexadecimal = Hexadecimal + '0';  
                break;  
            case 1 :   
                Hexadecimal = Hexadecimal + '1';  
                break;  
            case 2 :   
                Hexadecimal = Hexadecimal + '2';  
                break;  
            case 3 :   
                Hexadecimal = Hexadecimal + '3';  
                break;  
            case 4 :   
                Hexadecimal = Hexadecimal + '4';  
                break;  
            case 5 :   
                Hexadecimal = Hexadecimal + '5';  
                break;  
            case 6 :   
                Hexadecimal = Hexadecimal + '6';  
                break;  
            case 7 :   
                Hexadecimal = Hexadecimal + '7';  
                break;  
            case 8 :   
                Hexadecimal = Hexadecimal + '8';  
                break;  
            case 9 :   
                Hexadecimal = Hexadecimal + '9';  
                break;  
            case 10 :   
                Hexadecimal = Hexadecimal + 'A';  
                break;  
            case 11 :   
                Hexadecimal = Hexadecimal + 'B';  
                break;  
            case 12 :   
                Hexadecimal = Hexadecimal + 'C';  
                break;  
            case 13 :   
                Hexadecimal = Hexadecimal + 'D';  
                break;  
            case 14 :   
                Hexadecimal = Hexadecimal + 'E';  
                break;  
            case 15 :   
                Hexadecimal = Hexadecimal + 'F';  
                break;  
        }  
    }  
      
    /* Truncating Extra 0s from beginning, if any */  
    while(Hexadecimal[0]=='0')  
    {  
        Hexadecimal.erase(Hexadecimal.begin()+0);  
    }  
      
    /*Printing the result */  
    cout<<"The Hexadecimal of "<<Octal<<" is "<<Hexadecimal;  
}