Write a recursive function that parses a hex number as a string into a decimal integer. The function header is as follows:def hexToDecimal(hexString):Write a test program that prompts the user to enter a hex string and displays its decimal equivalent.

Use C++

The function ver() is defined as follows: void ver(char "pc) { char c; if( "pc == "\O' ) return; c = "pc; ++pc; ver(pc); putchar(c); Show the output when function ver() is called as follows: ver("recursion");

C++

c programming Task 3: Complete armstrong_task3.c by implementing armstrong_recursive function. int armstrong_recursive (int arm); It performs same operation as in Task 1, however in a recursive manner. A number to be checked whether it is armstrong or not is given as an input and the function returns the summation of the digits. If the returned value is equal to the given input value then it is an armstrong number.

5. use c code to Write a stringSearch function that gets two strings one called needle and the other called haystack. It then searches in the Haystack for the needle. If it finds it, it returns the index of where the needle starts in the haystack. If the needle cannot be found, it should return -1 Prototype: int stringSearch(char needle[], char haystack) Example1: Haystack: “This is just an example” Needle: “just” Result: 8 Example2: Haystack: “This is just an example” Needle: “This” Result: 0 Example3: Haystack: “This is just an example” Needle: “this” Result: -1 Hint: all the answer need to include an output and use c code to answer