char * hexAnswer;
hexAnswer = binaryToHex(answer) //answer is the binary number of type int

char * binaryToHex(int n)
{
   //break into groups of 4
   //send group of 4 to switch statement of equivalent hexadecimal conversion
   //append the converted groups together

    //Return hex number

}

char * IndividualBinToHex (/*The group of 4 binary digits*/) {

switch (/*group of 4 binary digits*/) {
    case '0000':
        return "0";
        break;
    case '0001':
        return "1";
        break;

    case '00010':
        return "2";
        break;

    case '0011':
        return "3";
        break;

    case '0100':
        return "4";
        break;

    case '0101':
        return "5";
        break;

    case '0110':
        return "6";
        break;

    case '0111':
        return "7";
        break;

    case '1000':
        return "8";
        break;

    case '1001':
        return "9";
        break;

    case '1010':
        return "A";
        break;

    case '1010':
        return "a";
        break;

    case '1011':
         return "B";
         break;

    case '1100':
        return "C";
        break;

    case '1101':
        return "D";
        break;

    case '1110':
        return "E";
        break;

    case '1111':
        return "F";
        break;
     }
   }