How to read a binary number as input?

Question

Is there a way for the user to input a binary number in C or C++?

If we write something like

int a = 0b1010;
std::cout << a << std::endl
         


        

Answer 1

To take binary number as input, there are two ways I use frequently:

(Key note: Take the input as string!!! use: #include)

1. The to_ulong() method of the bitset template of the bitset library
   • for this you need to include the bitset library using #include

Example :

string s;
cin>>s; // Suppose s = "100100101"
int n = (int) bitset<64>(s).to_ulong();
cout<

Explore more about bitset here and about to_ulong() here.

2. The stoi() method of the string library
   • for this you need to include the string library using #include

Example :

string s;
cin>>s; // Suppose s = "100100101"
int n = stoi(s, 0, 2);
cout<

Explore the format of stoi() here.