Replace Bit Field in a 32-bit Register

Code

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

uint32_t replace_field(uint32_t reg, uint32_t val, uint8_t pos, uint8_t len) {
    for (uint8_t i = 0; i < len; i++)
    {
        if (val & 1)
        {
            reg |= (1 << (pos + i));
        }
        else
        {
            reg &= ~(1 << (pos + i));
        }

        val >>= 1;
    }

    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;
}

Solving Approach