std::bitset::to_ullong and std::bitset::to_ulong in C++

Learn about two useful functions of c++ that are  std::bitset::to_ullong and std::bitset::to_ulong. Both of these functions are found in std::bitset the header.

std::bitset represents a sequence of bits whose size is fixed and is stored in 0,1 form. ‘0’ represents a false value or unset bit and ‘1’ represents a true value or set bit. std::bitset have constructors that create bitset from a string as well as an integer.

std::bitset::to_ulong

• std::bitset::to_ulong converts the bitset content into an unsigned long integer.
• This function takes no parameter.
• This function returns an unsigned long integer.
• Whenever an exception is thrown, bitset content remained unchanged.

Example 1

#include <bitset> 
#include <iostream> 
#include <limits> 
using namespace std; 
  
int main() 
{ 
    bitset<numeric_limits<unsigned long>::digits> p(15); // Integer input
    cout << p << " as an unsiged long Integer is : " << p.to_ulong() << endl;; 
    return 0; 
}

Output :

0000000000000000000000000000000000000000000000000000000000001111 as an unsiged long Integer is : 15

Example 2

#include <bitset> 
#include <iostream> 
#include <limits> 
using namespace std; 
  
int main() 
{ 
    bitset<numeric_limits<unsigned long>::digits> p("1101"); //String input
    cout << p << "as an unsiged long Integer is : " << p.to_ulong() << endl;; 
    return 0; 
}

Output :

0000000000000000000000000000000000000000000000000000000000001101 as an unsiged long Integer is : 13

std::bitset::to_ullong

• std::bitset::to_ullong converts the bitset content into an unsigned long long integer.
• This function takes no parameter.
• An unsigned long long integer is returned by this function.
• Whenever an exception is thrown, bitset content remained unchanged.

Example 1

#include <bitset> 
#include <iostream> 
#include <limits> 
using namespace std; 
  
int main() 
{ 
    bitset<numeric_limits<unsigned long>::digits> p(10); //Integer Input
    cout << p << "as an unsiged long Integer is : " << p.to_ullong() << endl;; 
    return 0; 
}

Output :

0000000000000000000000000000000000000000000000000000000000001010 as an unsiged long long Integer is : 10

Example 2

#include <bitset> 
#include <iostream> 
#include <limits> 
using namespace std; 
  
int main() 
{ 
    bitset<numeric_limits<unsigned long>::digits> p("1011"); //String Input
    cout << p << "as an unsiged long Integer is : " << p.to_ullong() << endl;; 
    return 0; 
}

Output :

0000000000000000000000000000000000000000000000000000000000001011 as an unsiged long long Integer is : 11