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 = 0x1f;
    uint32_t value = ((reg>>10) & mask);
    value = value < 30 ? value+1 : value;
    reg &= ~(mask<<10);
    reg |= ((value & mask)<<10);
    return reg;
}

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