stoi in cpp code example

Example 1: convert stirng to int c++

int thing = std::stoi(string);

Example 2: c++ string to int

atoi( str.c_str() )

Example 3: string to int c++

// stoi example
#include <iostream>   // std::cout
#include <string>     // std::string, std::stoi

int main ()
{
  std::string str_dec = "2001, A Space Odyssey";
  std::string str_hex = "40c3";
  std::string str_bin = "-10010110001";
  std::string str_auto = "0x7f";

  std::string::size_type sz;   // alias of size_t

  int i_dec = std::stoi (str_dec,&sz);
  int i_hex = std::stoi (str_hex,nullptr,16);
  int i_bin = std::stoi (str_bin,nullptr,2);
  int i_auto = std::stoi (str_auto,nullptr,0);

  std::cout << str_dec << ": " << i_dec << " and [" << str_dec.substr(sz) << "]\n";
  std::cout << str_hex << ": " << i_hex << '\n';
  std::cout << str_bin << ": " << i_bin << '\n';
  std::cout << str_auto << ": " << i_auto << '\n';

  return 0;
}

Example 4: c++ string to integer without stoi

#include <iostream>
#include <sstream>

using namespace std;

int main() 
{
    string s = "999";

    stringstream degree(s);

    int x = 0;
    degree >> x;

    cout << "Value of x: " << x;
}

Example 5: stoi() c++

// convert string to int number.
int number = stoi(str)
int number = stoi(str,nulptr,10);//base 10
int number = stoi(str.c_str());

Example 6: stoi in c++

stoi()
//a function used to convert string to integer!