Convert Binary to hexadecimal

Question

I want to convert 7 Binary numbers from user to hexadecimal in cpp

Answer 1

If you read the input as a char[] you can use
int x = strtol(input, NULL, 2); /* <stdlib.h> */
to store the input in x and
printf("%X",x); /* <stdio.h> */
to print it out as hexadecimal number.

Answer 2

10110100