while ( secretcode<48 || secretcode>122){ /*According to the ASCII TABLE;0-9 has ASCII code of 48-57 and uppercase letters (A-Z)have ASCII code of 65-90 and lowercase characters have ASCII code of 98-122.So that it is certain that secretcode should not be lower than 48 and upper than 122.*/
                      printf("ERROR! The user entered another character,so enter another character again!\n");
                      scanf("\n%c",&secretcode);}

                 while (secretcode>0){ /* I will use this algorithm to convert decimal numbers to binary form */

                  remainder= secretcode%2;
                  power=pow(10,place);

                  binary=binary+(remainder*power);
                  place++;
                  secretcode=secretcode/2;}