Extract and Modify Field in a 32-bit Register

Code

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

#define BIT 10
#define MASK ((0x1F) << BIT)

uint32_t update_register(uint32_t reg) {
    uint8_t res = (reg & MASK) >> BIT;
    
    if (res < 0x1F) res++;

    reg &= ~(MASK);
    return reg | (res << BIT);
}

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

Solving Approach