string class provides several other functions that you can
invoke on strings. The
find function is like the opposite the
operator. Instead of taking an index and extracting the character at
find takes a character and finds the index where that
Take a look at the active code below, which uses the
find function to find
'a' in string
fruit and string
This example finds the index of the letter
'a' in the string. In
this case, the letter appears three times, so it is not obvious what
find should do. According to the documentation, it returns the index
of the first appearance, so the result is 1. If the given letter does
not appear in the string,
find returns -1.
In addition, there is a version of
find that takes another
string as an argument and that finds the index where the substring
appears in the string.
The active code below finds the starting index of
This example returns the value 2.
You should remember from Section [overloading] that
there can be more than one function with the same name, as long as they
take a different number of parameters or different types. In this case,
C++ knows which version of
find to invoke by looking at the type of
the argument we provide.
Construct a block of code that correctly finds and prints where the first “B” is in the string. Declare