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C++ String find_first_of() function

C++ String find_first_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_of()

This function is used for finding the location of first occurrence of the specified characters.

Syntax

Consider string str1 and str. Syntax would be :

str1.find_first_of(str);

Parameters

str : string containing characters to be searched for.

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 searched character.

Examples 1

Let's see the simple example.

#include<iostream>
using namespace std;
int main()
{
        string str1 = "Dancing is my favorite hobby";
        cout << "String contains :"<< str1<< '\n';
        cout <<"Position of the first occurrence of the string 'favorite' is " <<                      str1.find_first_of("favorite");
         return 0;         
}

Output:

String contains : Dancing is my favorite hobby
Position of the first occurrence of the string favorite is 1

Examples 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 programming world";
cout<< "String contains : "<< str <<'\n';
 cout<<"Now, start the search from the second position and we find the first occurrence of the 'programming' is :"<<str.find_first_of("programming",2);
return 0;
}

Output:

String contains : Welcome to the programming world
Now, start the search from the second position and we find the first occurrence of the 'programming' is : 4

Examples 3

Let's see the simple example to find the position of the first occurrence of a single character.

#include<iostream>
using namespace std;
int main()
{
string str = "TheDeveloperBlog tutorial";
cout << "String contains :" << str<< '\n';
cout <<"Position of the first occurrence of 'a' character is :" << str.find_first_of('a');
return 0;
}

Output:

String contains TheDeveloperBlog tutorial
Position of the first occurrence of 'a' character is : 1

Next TopicC++ Strings




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