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) {
    for(int i=0; i<len; i++){
        reg |=(1 << i+pos);
    }
    return reg;
}

int main() {
    uint32_t reg = 0b00000000000000000000000000000000;
    uint8_t pos = 4;
    uint8_t len = 3; 
    set_bits(reg,pos,len);
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", set_bits(reg, pos, len));
    return 0;
}

Solving Approach