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) {
uint32_t reg2 = 0;
    if((pos >= 0 && pos <= 31) && (len >= 0 && len <= 31)){
       for(uint32_t i = pos; i < (pos+len) ; i++){
        reg2 |= (1 << i);
    } 

    reg |= reg2;
    }
    
    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