Extract and Modify Field in a 32-bit Register

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

uint32_t update_register(uint32_t reg) {
    unsigned int mask = ((1<<5) -1U);
    uint8_t temp = (reg >> 10) & mask;
    if(temp < 31) temp++;
    reg &= ~(mask<<10);
    reg |= temp<<10;
    return reg;
}

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