26. Extract and Modify Field in a 32-bit Register

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

uint32_t update_register(uint32_t reg) {
    uint32_t mask = ((1 << 6) - 1) << 10;
    uint32_t newreg = (mask & reg) >> 10;
    if(newreg < 31) newreg = newreg + 1;
    else return reg;

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

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