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 extract = ((reg >> 10) & 0x1F); //extraction bits from 10 - 14

    uint32_t field = (((1 << 5) - 1) << 10); //field bits 10 - 14

    reg &= ~(field); //clear field bits from 10 - 14

    if ( extract < 31) //check if less and if not increment
    {
        extract++;
    }

    reg |= ((extract & ((1 << 5) - 1)) << 10); //put it all together now

    return reg;
}

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