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

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

#define BIT_MASK (((1u << 5) -1) << 10)

uint32_t update_register(uint32_t reg) {
    uint32_t res = (reg & BIT_MASK) >> 10;
    if(res < 31)
    {
        res++;
    }
    reg &= ~(BIT_MASK); 
    return reg | (res << 10);
}

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