#include <iostream>
#include <string>
/*
Conversion Quick Reference
--------------------------------------
std::stoi(str); // int
std::stol(str); // long
std::stoll(str); // long long
std::stoul(str); // unsigned long
std::stoull(str); // unsigned long long
std::stof(str); // float
std::stod(str); // double
std::stold(str); // long double
str.c_str(); // const char*
str.at(0); // char
*/
int main()
{
// Source strings
std::string intStr = "42";
std::string longStr = "123456789";
std::string doubleStr = "3.14159";
std::string boolStr = "1";
std::string charStr = "A";
try
{
/*
* Convert std::string to int
*/
int intValue = std::stoi(intStr);
/*
* Convert std::string to long
*/
long longValue = std::stol(longStr);
/*
* Convert std::string to float
*/
float floatValue = std::stof(doubleStr);
/*
* Convert std::string to double
*/
double doubleValue = std::stod(doubleStr);
/*
* Convert std::string to bool
* Convention:
* "0" = false
* non-zero = true
*/
bool boolValue = (std::stoi(boolStr) != 0);
/*
* Convert std::string to char
*/
char charValue = charStr.at(0);
/*
* Convert std::string to C-style string
*/
const char* cString = intStr.c_str();
/*
* Convert std::string to unsigned int
*/
unsigned int uintValue =
static_cast<unsigned int>(std::stoul(intStr));
/*
* Convert std::string to long long
*/
long long llValue = std::stoll("922337203685477580");
/*
* Convert std::string to unsigned long long
*/
unsigned long long ullValue =
std::stoull("184467440737095516");
std::cout << "int: " << intValue << '\n';
std::cout << "long: " << longValue << '\n';
std::cout << "float: " << floatValue << '\n';
std::cout << "double: " << doubleValue << '\n';
std::cout << "bool: " << std::boolalpha
<< boolValue << '\n';
std::cout << "char: " << charValue << '\n';
std::cout << "c-string: " << cString << '\n';
std::cout << "unsigned int: " << uintValue << '\n';
std::cout << "long long: " << llValue << '\n';
std::cout << "unsigned long long: "
<< ullValue << '\n';
}
catch (const std::invalid_argument& e) {
std::cerr << "Invalid conversion: "
<< e.what() << '\n';
}
catch (const std::out_of_range& e) {
std::cerr << "Value out of range: "
<< e.what() << '\n';
}
}
/*
run:
int: 42
long: 123456789
float: 3.14159
double: 3.14159
bool: true
char: A
c-string: 42
unsigned int: 42
long long: 922337203685477580
unsigned long long: 184467440737095516
*/
