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;
    uint8_t mask = 0x1F;
    
    field = (reg >> 10);
    field &= mask;

    if (field < 31){
        field +=1;
        reg &= ~(mask<<10);
        reg |= (field <<10);
    }

    return reg;
}

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