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) {
    unsigned int reg_clear;
    int mask = 0;
    for(int i = pos; i < pos+len; i++)
    {
        mask |= (1 << i);
    }
    reg_clear = (reg & ~mask);
    return reg_clear;
}

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;
}