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

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

uint32_t update_register(uint32_t reg) {
    uint32_t field_value = (reg << 17) >> 27;
    if (field_value < 31) {
        reg &= ~(((1 << 5)-1) << 10);
        reg |= ((field_value+1) << 10);
    }

    return reg;
}

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