27. Extract Bit Field from 16-bit Register

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


uint8_t extract_field(uint16_t reg) {
    
    //reg = 0000 0001 1111 0000 → bits 4–8 are all 1
    // pos =4  len = 4   //, 4,5,6,7
    reg = reg >> 4;
    
    uint16_t mask = ((1U<<5)-1);
    
     
    return (uint8_t) (reg & mask);
}


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