Convert Binary to Decimal in C++

Here you will learn how to convert binary to decimal in C++.

We can convert a binary number into decimals in the following way.

  • Multiply each digit from right to left by a power of 2. Here the power of 2 will be the position of the digit starting from 0.
  • Now add all the values to obtain the decimal number.

Also Read: Convert Decimal to Binary in C++

C++ Program to Convert Binary to Decimal

#include<iostream>
#include<math.h>

using namespace std;

int main()
{
	unsigned long i,n,num=0,d;
	cout<<"Enter any Binary number:";
	cin>>n;
	cout<<"\nThe Decimal conversion of "<<n<<" is ";
	
	for(i=0;n!=0;++i)
	{
	d=n%10;
	num=(d)*(pow(2,i))+num;
	n=n/10;
	}

	cout<<num;
	return 0;
}

Output:

Enter any Binary number:111
The Decimal conversion of 111 is 7

2 thoughts on “Convert Binary to Decimal in C++”

    1. /*This is another approach, but this has a flaw while used in C++. This code works perfectly in C language.
      This program uses the Algo with the least no of executable lines in C to perform the binary to decimal conversion, hence the quickest known to me. To know about the flaw or any doubt in the code U can ask me on this email id : abhishekroy.id@gmail.com*/

      #include

      void main()
      {
      long int bnum,dnum=0,base=1,rem;

      cout<<"Enter the binary number : ";
      cin>>bnum;

      while(bnum!=0)
      {
      rem = bnum%10;
      dnum = dnum+rem*base;
      base = base*2;
      bnum = bnum/10;
      }
      cout<<"nEquivalent decimal value : "<<dnum;
      }

      //cheers!!!

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