20. Clear Specific Bits in a 32-bit Register

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

#define SET_MASK(POS,LEN)    (((1<<(LEN))- 1) << (POS))

uint32_t clear_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t mask = SET_MASK(pos,len);
    reg &= ~(mask);
    return reg;
}

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