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

rather do it yourself:

uint32_t a = 0;

char c;
while ((c = getchar()) != '\n') { // read a line char by char
  a <<= 1;                        // shift the uint32 a bit left
  a += (c - '0') & 1;             // convert the char to 0/1 and put it at the end of the binary
}

printf("%u\n", a);