Question

c++ programming:

Write a function called baseConverter(string number, int startBase, int endBase) in c++ which converts any base(startBase) to another (endBase) by first converting the start base to decimal then to the end base. Do not use library. (bases 1-36 only)

Answer 1

Given below is the code for the question. Please do rate the answer if it helped. Thank you.

#include <iostream>
using namespace std;

string baseConverter(string number, int startBase, int endBase)
{
   long decimal = 0;
   char c;
   int val, rem;
   int power = 1;
   string result = "";
  
   //convert to decimal
   for(int i = number.size() - 1; i >= 0; i--){
       c = number[i];
       if(c >= '0' && c <= '9')
           val = c - '0';
       else if(c >= 'A' && c <= 'Z')
           val = c - 'A' + 10;
       else if(c >= 'a' && c <= 'z')
           val = c - 'a' + 10;
      
       decimal = decimal + val * power;
       power = power * startBase;
   }
  
   //convert from decimal to endBase by repeated division and get remainders
   while(decimal > 0){
       rem = decimal % endBase;
       decimal = decimal / endBase;
       if(rem >= 10)
           c = 'A' + (rem - 10);
       else
           c = '0' + rem;
       result = c + result;
   }
  
   if(result == "")
       result = "0";
   return result;
}

int main(){
   cout << baseConverter("ABCD", 16, 10) << endl;
}