Extract and Modify Field in a 32-bit Register

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

uint32_t update_register(uint32_t reg) {
    uint8_t currentVal = (reg>>10) & 0x1F;
    uint32_t mask = ((1<<6) - 1) << 10;
    if(currentVal < 31) currentVal++;
    reg &= ~mask;
    reg = reg | (currentVal << 10);
    return reg;
}

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