How to use C++ STL string stream method In C++

5. Using C++ STL boost:lexical_cast function

When the base field format is set to hex, the integer values of that hex value are stored in the stream. It is done by using a hex manipulator.

Below is the C++ program to implement stringstream method to convert a hex string to an integer:

C++

// C++ program to implement 
// stringstream method to 
// convert a hex string to 
// an integer
#include <bits/stdc++.h>
using namespace std;
 
// Driver code
int main()
{
  string s = "DD";
  int i;
 
  // Used for breaking words
  istringstream iss(s);
 
  // Converting to integer and 
  // storing it to i
  iss >> hex >> i;
 
  cout << i << endl;
 
  return 0;
}

Output

Different Ways to Convert Hex String to Integer in C++ STL

A hexadecimal number is a number whose base is 16. has numerals 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15. And 10, 11, 12, 13, 14, and 15 these numbers are denoted by A, B, C, D, E, F. In C++ STL there are certain properties that help to convert a hexadecimal string or number to a decimal number easily.

There are 5 different ways to convert a Hex string to an Integer in C++: