How do I convert a binary string to hex using C?

Question

How do I convert an 8-bit binary string (e.g. \"10010011\") to hexadecimal using C?

Answer 1

Something like that:

char *bin="10010011";
char *a = bin;
int num = 0;
do {
    int b = *a=='1'?1:0;
    num = (num<<1)|b;
    a++;
} while (*a);
printf("%X\n", num);