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

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

uint32_t update_register(uint32_t reg) {
    // Your logic here
    //step1 : extract the target field from reg
    uint32_t mask = reg & (((1U<<6) -1)<<10);
    mask >>= 10;
    //step2 : check the value 
    if(mask<31){
        mask++;
        //clear the targeted field before updating
        reg &= ~(((1U<<6)-1)<<10);
        reg |= (mask << 10);
    }
    return reg;
}

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