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) {
    // Your code here
    //Create a "mask" that has 1s only in the positions you want to change, and 0s everywhere else.
    uint32_t mask = (1<<len) - 1;

    //Shift that sequence to the starting pos
    //Apply OR: Combine it with the original register.
    return reg |= (mask << 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