26. Extract and Modify Field in a 32-bit Register

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

#define BIT_FIELD_LENGTH 5
#define BIT_FIELD_START  10
#define BIT_FIELD_MASK (((1 << BIT_FIELD_LENGTH) - 1) << BIT_FIELD_START)

uint32_t update_register(uint32_t reg) {
    // Your logic here
    uint32_t bit_field_value = (reg & BIT_FIELD_MASK) >> BIT_FIELD_START;
    if(bit_field_value < 31) {
        bit_field_value++;
        bit_field_value <<= BIT_FIELD_START;
        reg &= ~BIT_FIELD_MASK;
        reg |= bit_field_value;
    }

    return reg;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    uint32_t updated = update_register(reg);
    printf("%u", updated);
    return 0;
}