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

C++ For Loop: Exercise-77 with Solution

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

Pictorial Presentation:

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

Sample Solution:-

C++ Code :

#include <iostream>
#include <math.h>
using namespace std;
 
int main()
{
  int octal_numvalues[] = {0, 1, 10, 11, 100, 101, 110, 111};
  long octal_num, tempoctal_num, binary_num, place;
  int rem;
	cout << "\n\n Convert any octal number to binary number:\n";
	cout << "------------------------------------------------\n";
	cout << " Input any octal number: ";
	cin>> octal_num;
	tempoctal_num = octal_num;
	binary_num = 0;
	place = 1;
	while (tempoctal_num != 0)
	{
	rem = (int)(tempoctal_num % 10);
	binary_num = octal_numvalues[rem] * place + binary_num;
	tempoctal_num /= 10;
	place *= 1000;
	}
  cout<<" The equivalent binary number: " << binary_num <<"\n";
} 

Sample Output:

 Convert any octal number to binary number:                            
------------------------------------------------                       
 Input any octal number: 17                                            
 The equivalent binary number: 1111 

Flowchart:

Flowchart: Convert a octal number to binary number

C++ Code Editor:

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

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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