Chapter 9, Problem 5E

Write a function called f to determine if one character string exists inside another string. The first argument to the function should be the character string that is to be searched and the second argument is the string you are interested in finding. If the function finds the specified string, have it return the location in the source string where the string was found. If the function does not find the string, have it return –1. So, for example, the call

i

searches the string̎ for the string̎. Because̎ does exist inside the source string, the function returns 3 to indicate file starting position inside the source string where̎ was found.