Understanding the Key Differences: Stoi vs Stoll in C++

In C++, understanding the differences between stoi and stoll is crucial for effective string-to-integer conversions. Both functions serve to convert strings into integers, but they differ in the size of the integer they return. This article will explore these differences, helping you choose the right function for your needs.

#include<bits/stdc++.h>
using namespace std;
int main()
{
    //stoi...string to integer..
    string s = "1234";
    int x = stoi(s);
    cout<<x+5<<endl;

    //stoll...string to long long..
    string str = "1234567891234";// big number, cant store in int and cant convert using stoi
    long long y = stoll(str);
    cout<<y+1<<endl;
    return 0;
}

In conclusion, both stoi and stoll are valuable functions in C++ for converting strings to integers, each serving different needs based on the size of the integer required. Stoi is suitable for converting strings to int, which is typically a 32-bit integer, while stoll is used for converting strings to long long, generally a 64-bit integer. Understanding these differences allows developers to choose the appropriate function, ensuring efficient and accurate data handling in their applications.