C++ String find_first_not_of() function

C++ String find_first_not_of function tutorial for beginners and professionals with examples on constructor, if-else, switch, break, continue, comments, arrays, object and class, exception, static, structs, inheritance, aggregation etc.

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C++ String find_first_not_of()

This function is used to search the string for the first character that does not match any of the characters specified in the string.

Syntax

Consider two strings str1 and str2. Syntax would be :

str1.find_first_not_of(str2);

Parameters

str : str is the string to be used in searching.

pos : It defines the position at which to start the search.

n : Number of characters identifying characters to be searched for.

ch : It defines the character which is to be searched

Return value

It returns the position of the first character that does not match.

Example 1

Lets see the simple example.

#include<iostream>
using namespace std;
int main()
{
string str = "Hello";
cout<< "String contains :" << str <<'\n';
            cout<< str.find_first_not_of("Hllo");
           }

Output:

String contains : Hello
1

Example 2

Let's see the simple example when the position at which to start the search is specified.

#include<iostream>
using namespace std;
int main()
{
string str = "Welcome to the TheDeveloperBlog";
cout<< "String contains :" << str <<'\n';
cout<< str.find_first_not_of("COME",3);
return 0;
 }

Output:

String contains : Welcome to the TheDeveloperBlog
3

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