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 mask = (1u << 5) - 1;
    uint8_t value = (reg >> 10) & mask;
    if(value < 31){
        value += 1;
        reg &= ~(mask<<10);
        reg |= ((value & mask) << 10);
    }
    return reg;
}

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