please answer the question below using C programing

1) Write a C Program which converts Binary Number to Decimal and vice-versa. Your program must contain two functions. You have to ask the choice for the user if he/she enter 1 you have to work with BinToDec function if the choice is 2 you have to work with DecToBin function. Both functions take the number in int main part and you have to print the answer in int main part.