Extract and Modify Field in a 32-bit Register

Code

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

uint32_t update_register(uint32_t reg) {
    const uint32_t POS  = 10u;
    const uint32_t MASK = 0x1Fu << POS; 

    uint32_t field = (reg >> POS) & 0x1Fu;  // extract 5-bit field

    if (field < 31u) {
        field += 1u;                        // increment (still <= 31)
        reg = (reg & ~MASK) | (field << POS); // clear then set
    }

    return reg;
}

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

Solving Approach