Write a program that uses a do while loop to convert a $4$ digit hexa decimal number to decimal. This program would use two methods $(1)$ int$[]$ char$\_$to$\_$num$($ char digits$],$ int size$=4)$ that converts characters to numbers or generates an error $(2)$ int hex$\_$to$\_$dec $($int values$[])$ to generate the decimal value of the array generated by the char$\_$to$\_$num