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

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

uint32_t update_register(uint32_t reg) {
    uint8_t field = (reg >> 10) & ((1U << 5) - 1);
    uint32_t reg_new = reg & ~(((1U << 5) - 1) << 10);
    if (field < 31) {
        field++;
        return reg_new |= (field << 10);
    } else {
        return reg_new |= (field << 10);
    }
}

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