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

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

uint32_t update_register(uint32_t reg) {
    //Intuition:
    //Extract bits at pos10-14
    //Clear bits at pos 10-14
    //Add 1 to the temporary 5 bit field, if < 31
    //Set bits at pos10-14;

    uint32_t mask = ((1U<<5)-1); //5 length bitmask
    uint32_t extracted = ((reg >> 10) & mask);
    if(extracted < 31) extracted +=1;

    reg &= ~(mask << 10); //Clear
    reg |= ((extracted & mask) << 10);
    return reg;
}

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