Substrings
Class string provides member function substrm for retrieving a substring from a string. The result is a new string object that is copied from the source string. Figure 18.3 demonstrates substr.
Figure 18.3. Demonstrating string member function substr.
(This item is displayed on pages 890 - 891 in the print version)
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1 // Fig. 18.3: Fig18_03.cpp 2 // Demonstrating string member function substr. 3 #include 4 using std::cout; 5 using std::endl; 6 7 #include 8 using std::string; 9 10 int main() 11 { 12 string string1( "The airplane landed on time." ); 13 14 // retrieve substring "plane" which 15 // begins at subscript 7 and consists of 5 elements 16 cout << string1.substr( 7, 5 ) << endl; 17 return 0; 18 } // end main
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The program declares and initializes a string on line 12. Line 16 uses member function substr to retrieve a substring from string1. The first argument specifies the beginning subscript of the desired substring; the second argument specifies the substring's length.