27. Extract Bit Field from 16-bit Register

#include <stdio.h>
#include <stdint.h>

uint8_t extract_field(uint16_t reg)
 {
uint16_t mask=0;
mask |= (((1U<<5)-1)<<4);
uint16_t field1 = ((reg&mask)>>4);
return field1;
}

int main() {
    uint16_t reg;
    scanf("%hx", &reg);
    printf("%u", extract_field(reg));
    return 0;
}