2. Substrings
Use .substr() to get a substring
First parameter is starting index, second
(optional) is the number of characters in
the substring. (By default it is all of them.)
string s = “Ronald”;
cout<<s.substr(0); //prints Ronald
cout<<s.substr(0,3); //prints Ron
cout<<s.substr(1,2); //prints on
3. Insert and find
string s = “AM”;
string s1 = s.insert(1,”DA”);
Inserts “DA” into s starting at position 1.
cout<<s1; //prints ADAM
s.find(“AD”); //value of first position
4. Comparison
Use ==, <, >, !=, <=, >=
Comparison is on ASCII value, so ‘A’ < ‘a’,
(‘A’ == 65 and ‘a’ == 97), so comparisons
are most useful on all lower-case or all
upper-case strings.
A useful tool is the toupper(c) is a function
that takes a char parameter and returns the
uppercase version.
5. Cstring equivalents
#include <cstring>
Cstrings are declared as char cs[] = ….
strlen(cs); //returns the length of cs
strcat(cs1,cs2); //concatenates two
cstrings
