Set Specific Bits in a 32-bit Register

/* This code is to set specific bits in a 32bit register
   submitted by Manish Gowda T
   accomplished by leftshift and OR function*/





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

uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    uint32_t answer=reg | ((1<<len)-1)<<pos;
    return answer;
}

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;
}

First we need to left shift by length
then we subract by 1,to get number of bits to be placed
then we move them by pos mentioned by user