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

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

uint32_t update_register(uint32_t reg) {
    // Mask on those bits
    uint32_t mask = ~(((1u << 5) - 1) << 10);

    // Extract the value
    uint32_t val = (~mask & reg) >> 10; 
    if (val < 31) {
        val++;
        reg &= mask; 
        reg |= (val << 10);
    }

    return reg;
}

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