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

#include <stdio.h>
#include <stdint.h>
#define NUM 5

uint32_t update_register(uint32_t reg) {
    uint32_t mask = (1U<<NUM)-1;
    uint32_t field = (reg>>10) & ((1U<<NUM)-1);
    if(field < 31)
    {
        field++;
        reg &=~ (mask<<10);
        reg |= (field<<10);
    }
    return reg;
}

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