1. Defining a hexadecimal number as in Problem 67, write the function int hexToDec(const int hexNum[]) to convert a four-digit hexadecimal number to a nonnegative decimal integer. Do not output the...

int hexToDec(const int hexNum[])

to convert a four-digit hexadecimal number to a nonnegative decimal integer. Do not output

the decimal integer in the function. Test your function with interactive input.

2.
Defining a hexadecimal number as in Problem 67, write the function

void decToHex(int hexNum[], int decNum)

to convert a nonnegative decimal integer to a four-digit hexadecimal number. Do not output

the hexadecimal number in the function. Test your function with interactive input.