octal2binary

#include<bits/stdc++.h>
using namespace std;
#define sz(x) int(x.size())
#define nl "\n"




void octalToBin(){

    string num ;
    cout <<"Enter the number in octal to convert it to binary : " ;
    cin >> num;

    vector < string > convert{"000" , "001" , "010" , "011" , "100" , "101" , "110" , "111" };

    string ans ="";
    for(int i = 0; i < num.size() ; i++){
        if(num[i]=='.')
            ans+='.';
        else if(num[i] >='0' and num[i] <='7')
            ans+=convert[num[i]-'0'] ;
        else
            return void(cout <<"Cann't be convert this number. "<< nl);
    }

    cout <<"Binary number : "<< ans << nl;

}

int main() {


    octalToBin();

    return 0;
}