Extract and Modify Field in a 32-bit Register

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

uint32_t update_register(uint32_t reg) {
    // Your logic here
    // lets figure out what the value is
    int mask = 31 << 10; // this is 11111 << 10;
    int val = (reg & mask) >> 10; // get val of register and pull down
    if (val < 31){
        val++;
    }

    return (reg & ~(mask)) | (val << 10);
}

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