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

#include <stdio.h>
#include <stdint.h>
uint32_t mark;
uint32_t haha;

uint32_t update_register(uint32_t reg) {
    
    mark = ((reg >> 10) & ( 0x0000003f));
    if(mark == 31)
    {
        mark = mark;
    }
    else {
    if
    ( mark < 31)
    {
        mark = mark +1;
    }
    
    }
    mark= mark << 10;
    haha = reg &~(0x000fC00);
    reg = haha + mark;
    return reg;
}

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