string::npos in C++
In this tutorial, We are going to learn about the string:: npos using C++. Let us know more about it.
What is string::npos?
It is a static member value with the maximum value for an element of type size_t which is the end of the string. As the Return value indicates no matches are found in the string. It simply states “no-position”. Below is the Syntax for using this
static const size_t npos = -1;
Let us see some examples to have a better understanding of the question.
Let us take an input of two strings str1= "an apple" str2 = "app" So the output first 'app' found at Index 3
IMPLEMENTATION OF THE CODE FOR string::npos
// Importing Header files #include <bits/stdc++.h> using namespace std; // Function that using string::npos for finding positions void fun(string s1, string s2) { // Find position of string s2 int found = s1.find(s2); // Check the position if (found != string::npos) { cout << "first " << s2 << " found at: " << (found) << endl; } else cout << s2 << " is not in" << "the string" << endl; } // Driver Code int main() { // Given strings string s1 = "An Apple a day keeps Doctor away"; string s2 = "App"; // Function Call fun(s1, s2); return 0; }
OUTPUT
First App is found at 3
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