string $\rightarrow$ int

• 1
    std::string s = "123";
  2
    int i;
  3
  
  4
    /* std to int */
  5
    i = stoi(string);
  

string $\rightarrow$ long

• 1
    std::string s = "123";
  2
    long i;
  3
  
  4
    /* std to long */
  5
    i = stol(string);
  

string $\rightarrow$ long long

• 1
    std::string s = "123";
  2
    long long i;
  3
  
  4
    /* std to long long */
  5
    i = stoll(string);
  

string $\rightarrow$ float

• 1
    std::string s = "123.4";
  2
    float i;
  3
  
  4
    /* std to float */
  5
    i = stof(string);
  

string $\rightarrow$ double

• 1
    std::string s = "123.4";
  2
    double i;
  3
  
  4
    /* std to double */
  5
    i = stod(string);
  

string $\rightarrow$ long double

• 1
    std::string s = "123.4";
  2
    long double i;
  3
  
  4
    /* std to long double */
  5
    i = stold(string);
  

• 1
    int i = 100;
  2
    std::string s = std::to_string(i);