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
    // 1. Set all bit uptil the max required, then clear the bits from LSB to ith pos
    // uint32_t mask = ((uint32_t)(1<<(pos+len))-1) & ~((uint32_t)(1<<pos)-1);
    // 2. Create #1s  based on the len given and then shift appropriately
    uint32_t mask = ((1U << len) - 1U) << pos;
    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