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 mask1 = (1 << (pos+len)) - 1;
    uint32_t mask2 = (1 << (pos)) - 1;
    mask1 = mask1 ^ mask2;
    reg = reg | mask1;
    return reg;
}
/*
0 1000 0000 - 1 = 0111 1111 // 127

0 0001 0000 - 1 = 0000 1111 // 15
*/

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