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
    uint8_t bit = 0 ;
    for(uint8_t i = 0; i < len ; i++)
    {
        bit = (val >> i) & 1;
        if(bit == 1 )
        {
            reg = reg | 1 << pos + i;
        }
        else 
        {
            reg = reg & ~(1 << pos + i);
        }
    }
    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;
}