The C++ find_first_not_of() member function code example part II

 

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C++

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C++ Code (/TP)

Other info: none

To do: Using the C++ find_first_not_of() member function to search through a string for the first character that is not any element of a specified string part II

To show: How to use the C++ find_first_not_of() member function to search through a string for the first character that is not any element of a specified string part II

 

// the C++ find_first_not_of() code sample part II

#include <string>

#include <iostream>

using namespace std;

 

int main(void)

{

// searching a string for a substring as specified by a C-string

string str3("Testing the find_first_not_of() part 3");

cout<<"str3 string is: "<<str3<<endl;

basic_string <char>::size_type index5, index6;

static const basic_string <char>::size_type npos = -1;

const char *cstr4 = "nro";

index5 = str3.find_first_not_of(cstr4);

 

cout<<"Operation: str3.find_first_not_of(cstr4)"<<endl;

if(index5 != npos)

cout<<"The index of the 1st occurrence of an "

<<"element in str3 other than one of the "

<<"characters in 'nro' is: "<<unsigned int(index5)<<endl;

else

cout<<"Elements in str3 contain only characters "

<<" in the string 'nro'. "<<endl;

const char *cstr5 = "nro";

index6 = str3.find_first_not_of(cstr5, index5+1, 2);

 

cout<<"\nOperation: str3.find_first_not_of(cstr5, index5+1, 2)"<<endl;

if(index6 != npos)

cout<<"The index of the second occurrence of an "

<<"element of 'nro' in str3 after the 0th "

<<"position is: "<<unsigned int(index6)<<endl<<endl;

else

cout<<"Elements in str3 contain only characters "

<<" in the string 'nro'"<<endl;

cout<<endl;

 

// searching a string for a substring as specified by a string

string str4("Testing the find_first_not_of() part 4");

cout<<"str4 string is: "<<str4<<endl;

basic_string <char>::size_type index7, index8;

string str5("tf7");

index7 = str4.find_first_not_of(str5, 3);

 

cout<<"Operation: str4.find_first_not_of(str5, 3)"<<endl;

if(index7 != npos)

cout<<"The index of the 1st non occurrence of an element of 'tf7' "

<<"in str4 after the 3rd position is: "<<unsigned int(index7)<<endl;

else

cout<<"Elements other than those in the substring 'tf7' "

<<"were not found in the string str4."<<endl;

string str6("in");

index8 = str4.find_first_not_of(str6);

 

cout<<"\nOperation: str4.find_first_not_of(str6)"<<endl;

if(index8 != npos)

cout<<"The index of the 1st occurrence of an "

<<"element of 'in' in str4 after the 0th "

<<"position is: "<<unsigned int(index8)<<endl;

else

cout<<"Elements other than those in the substring"

<<" 'in' were not found in the string str4."<<endl;

 

return 0;

}

 

Output example:

 

str3 string is: Testing the find_first_not_of() part 3

Operation: str3.find_first_not_of(cstr4)

The index of the 1st occurrence of an element in str3 other than one of the characters in 'nro' is: 0

 

Operation: str3.find_first_not_of(cstr5, index5+1, 2)

The index of the second occurrence of an element of 'nro' in str3 after the 0th position is: 1

 

str4 string is: Testing the find_first_not_of() part 4

Operation: str4.find_first_not_of(str5, 3)

The index of the 1st non occurrence of an element of 'tf7' in str4 after the 3rd position is: 4

 

Operation: str4.find_first_not_of(str6)

The index of the 1st occurrence of an element of 'in' in str4 after the 0th position is: 0

Press any key to continue . . .

 

 

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