Write a program in C using the string library that reads in an input string from the user and performs the following tasks using a series of function calls:

1. Search through the string for a specific character. If found, return the number of matches encountered. If not found, return a zero.
2. Print the string in reverse.
3. Attempt to convert the string to a floating point number. If a number is obtained, return that value. If no number is obtained, return a default result of your choice.
4. Delete the string recursively.