Convert Binary to Decimal in C++

By | March 24, 2011
Here you will learn how to convert binary to decimal in C++.


We can convert a binary number into decimal in following way.
  • Multiply each digit from right to left by 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 decimal number.

Convert Binary to Decimal in C++


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

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

  1. Fatal1ty

    i have seen this approach on the net many times, can u give us something new….like another method to perform this particular conversion ..

    1. Abhishek Roy

      /*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 :*/


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

      cout<<"Enter the binary number : ";

      rem = bnum%10;
      dnum = dnum+rem*base;
      base = base*2;
      bnum = bnum/10;
      cout<<"nEquivalent decimal value : "<<dnum;



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