20. Clear Specific Bits in a 32-bit Register

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

uint32_t clear_bits(uint32_t reg, uint8_t pos, uint8_t len){
    // Your code here

    unsigned int mask = 0;
    unsigned int mask_clear = 0;
    unsigned int result = 0;

    mask = ((1 << len) - 1) << pos;
    mask_clear = ~mask;

    result = reg & mask_clear;

    return result;
}

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;
}