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string at() in C++ - GeeksforGeeks

Last Updated : 04 Oct, 2024

The std::string::at() in C++ is a built-in function of std::string class that is used to extract the character from the given index of string. In this article, we will learn how to use string::at() in C++.

str.at(idx)

• idx: Index at which we have to find the character.

• Returns the character at the given index of the string.
• If the given index is less than 0 or greater than equal to the length of string, then it throws an out_of_range exception.

// C++ Program to show, how to use string::at()
// for extracting the character from given index
#include <bits/stdc++.h>
using namespace std;

int main() {
    string str("GeeksForGeeks");

    // Extracting the character of 0th index
    cout << str.at(0) << endl;

    // Extracting the character of 5th index
    cout << str.at(5) << endl;

    // Extracting the character of 9th index
    cout << str.at(9) << endl;

    return 0;
}

Time Complexity: O(1)
Auxiliary Space: O(1)

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