Extract Bit Field from 16-bit Register

Code

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

uint8_t extract_field(uint16_t reg) {
    // Your logic here
    uint16_t mask = ((uint16_t)pow(2,5) - 1) << 4;
    reg = (reg & mask)>>4;

    return uint8_t(reg);
}

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

Solving Approach