Set Specific Bits in a 32-bit Register

Code

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

uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    
    /// convert length to bits 
    uint8_t bit = 0; 
    for(int i = 0; i < len; i++)
    {
        bit = bit << 1;
        bit |= 1;
    }
    // printf("BIT: %x\n", bit);
    return reg |= (bit << pos);
}

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

Solving Approach