Forward and reverse lookup of the string class

1. forward and reverse lookup Functions

Forward search: S. Find (S0)

Reverse lookup: S. rfind (S0)

S indicates the string to be searched, and S0 indicates the substring to be searched. The return values of both functions are the values

The position of the first character in the original string to be searched.

2. Example:

# Include <iostream>
# Include <string>
Using namespace STD;
Int main (){
Int P0, P1;
String S = "abcdabcefabc ";
String S0 = "ABC ";
P0 = S. Find (S0 );
P1 = S. rfind (S0 );
Cout <"P0:" <P0 <Endl; // output result 0
Cout <"P1:" <P1 <Endl; // output result 9
Return 0;
}