21. Replace Bit Field in a 32-bit Register

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

uint32_t replace_field(uint32_t reg, uint32_t val, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t temp = val;
    if(val == 0){
        for(int i = 0; i < len;i++){
            reg &= ~(1 << (pos + i));
        }
    }else{
        for(int i =0;i<len;i++){
            reg &= ~(1 << (pos + i));
        }
        reg |= (val << pos);
    }
 
    return reg;
}

int main() {
    uint32_t reg, val;
    uint8_t pos, len;
    scanf("%u %u %hhu %hhu", &reg, &val, &pos, &len);
    printf("%u", replace_field(reg, val, pos, len));
    return 0;
}