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
    uint32_t mask = (1U<<len)-1;
    uint32_t shifted_mask = (mask<<pos);
    reg |= shifted_mask;
    return reg;
/*
    for(uint8_t i = pos; i<=len+pos-1;i++){
        uint32_t mask = (1<<i);
         reg |= mask;
    }
    return reg;
}*/
}

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