w3resource

C++ Exercises: Convert a binary number to hexadecimal number

C++ For Loop: Exercise-74 with Solution

Write a program in C++ to convert a binary number to hexadecimal number.

Pictorial Presentation:

C++ Exercises: Convert a binary number to hexadecimal number

Sample Solution:-

C++ Code :

#include <iostream>
#include <math.h>
using namespace std;
 
int main()
{
  int hex[1000];
  int i = 1, j = 0, rem, dec = 0, binaryNumber;
	cout << "\n\n Convert a binary number to hexadecimal number:\n";
	cout << "----------------------------------------------------\n";
	cout << " Input a binary number: ";
	cin>> binaryNumber;
  while (binaryNumber > 0) 
  {
   rem = binaryNumber % 2;
   dec = dec + rem * i;
   i = i * 2;
   binaryNumber = binaryNumber / 10;
  }
   i = 0;
  while (dec != 0) 
  {
   hex[i] = dec % 16;
   dec = dec / 16;
   i++;
  }
  cout<<" The hexadecimal value: ";
  for (j = i - 1; j >= 0; j--)
  {
   if (hex[j] > 9) 
   {
    cout<<(char)(hex[j] + 55)<<"\n";
   } 
   else
   {
    cout<<hex[j]<<"\n";
   }
  }
}

Sample Output:

 Convert a binary number to hexadecimal number:                        
----------------------------------------------------                   
 Input a binary number: 1011                                           
 The hexadecimal value: B

Flowchart:

Flowchart: Convert a binary number to hexadecimal number

C++ Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a program in C++ to convert a binary number to decimal number.
Next: Write a program in C++ to convert a binary number to octal number.

What is the difficulty level of this exercise?



Share this Tutorial / Exercise on : Facebook and Twitter

C++ Programming: Tips of the Day

What is a smart pointer and when should I use one?

This answer is rather old, and so describes what was 'good' at the time, which was smart pointers provided by the Boost library. Since C++11, the standard library has provided sufficient smart pointers types, and so you should favour the use of std::unique_ptr, std::shared_ptr and std::weak_ptr.

There was also std::auto_ptr. It was very much like a scoped pointer, except that it also had the "special" dangerous ability to be copied - which also unexpectedly transfers ownership.

It was deprecated in C++11 and removed in C++17, so you shouldn't use it.

std::auto_ptr<MyObject> p1 (new MyObject());
std::auto_ptr<MyObject> p2 = p1; // Copy and transfer ownership. 
                                 // p1 gets set to empty!
p2->DoSomething(); // Works.
p1->DoSomething(); // Oh oh. Hopefully raises some NULL pointer exception.

Ref : https://bit.ly/3mc9GHE