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The Standard Template Library and the string Class
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Here, num characters from strob beginning at the index specified by start will be appended to the invoking object In the second form, the first num characters of the null-terminated string str are appended to the invoking object In each case, a reference to the invoking object is returned Of course, it is much easier to use the + to append one entire string to another You will need to use the append( ) function only when appending a partial string You can insert or replace characters within a string using insert( ) and replace( ) The prototypes for their most common forms are shown here string &insert(size_type start, const string &strob); string &insert(size_type start, const string &strob, size_type insStart, size_type num); string &replace(size_type start, size_type num, const string &strob); string &replace(size_type start, size_type orgNum, const string &strob, size_type replaceStart, size_type replaceNum); The first form of insert( ) inserts strob into the invoking string at the index specified by start The second form of insert( ) inserts num characters from strob beginning at insStart into the invoking string at the index specified by start Beginning at start, the first form of replace( ) replaces num characters from the invoking string, with strob The second form replaces orgNum characters, beginning at start, in the invoking string with the replaceNum characters from the string specified by strob beginning at replaceStart In both cases, a reference to the invoking object is returned You can remove characters from a string using erase( ) One of its forms is shown here string &erase(size_type start = 0, size_type num = npos); It removes num characters from the invoking string beginning at start A reference to the invoking string is returned The following program demonstrates the insert( ), erase( ), and replace( ) functions
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// Demonstrate insert(), erase(), and replace() #include <iostream> #include <string> using namespace std; int main() { string str1("String handling C++ style"); string str2("STL Power");
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cout << "Initial strings:\n"; cout << "str1: " << str1 << endl; cout << "str2: " << str2 << "\n\n"; // demonstrate insert() cout << "Insert str2 into str1:\n"; str1insert(6, str2); cout << str1 << "\n\n"; // demonstrate erase() cout << "Remove 9 characters from str1:\n"; str1erase(6, 9); cout << str1 <<"\n\n"; // demonstrate replace cout << "Replace 8 characters in str1 with str2:\n"; str1replace(7, 8, str2); cout << str1 << endl; return 0; }
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Initial strings: str1: String handling C++ style str2: STL Power Insert str2 into str1: StringSTL Power handling C++ style Remove 9 characters from str1: String handling C++ style Replace 8 characters in str1 with str2: String STL Power C++ style
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The string class provides several member functions that search a string, including find( ) and rfind( ) Here are the prototypes for the most common versions of these functions
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The Standard Template Library and the string Class
size_type find(const string &strob, size_type start=0) const; size_type rfind(const string &strob, size_type start=npos) const; Beginning at start, find( ) searches the invoking string for the first occurrence of the string contained in strob If one is found, find( ) returns the index at which the match occurs within the invoking string If no match is found, then npos is returned rfind( ) is the opposite of find( ) Beginning at start, it searches the invoking string in the reverse direction for the first occurrence of the string contained in strob (ie, it finds the last occurrence of strob within the invoking string) If one is found, rfind( ) returns the index at which the match occurs within the invoking string If no match is found, npos is returned Here is a short example that uses find( ) and rfind( )
#include <iostream> #include <string> using namespace std; int main() { unsigned int i; string s1 = "Quick of Mind, Strong of Body, Pure of Heart"; string s2; i = s1find("Quick"); if(i!=string::npos) { cout << "Match found at " << i << endl; cout << "Remaining string is:\n"; s2assign(s1, i, s1size()); cout << s2; } cout << "\n\n"; i = s1find("Strong"); if(i!=string::npos) { cout << "Match found at " << i << endl; cout << "Remaining string is:\n"; s2assign(s1, i, s1size()); cout << s2; } cout << "\n\n";
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