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

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

#define FIELD_SHIFT 10
#define FIELD_WIDTH 5
#define FIELD_MASK (((1 << FIELD_WIDTH) - 1) << FIELD_SHIFT)

uint32_t update_register(uint32_t reg) {
    // Your logic here
    uint32_t field;
    field = (reg & FIELD_MASK) >> FIELD_SHIFT; // Extract

    if (field < 31) field++;

    reg = (reg & ~FIELD_MASK) | ((field << FIELD_SHIFT) & FIELD_MASK); // write back (clear first - set after)

    return reg;
}

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