Set Specific Bits in a 32-bit Register

Code

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

uint32_t setBits(uint32_t reg, int pos, int len) {
    uint32_t mask = ((1u << len) - 1) << pos;
    return reg | mask;
}

int main() {
    uint32_t reg;
    int pos, len;
    scanf("%u %d %d", &reg, &pos, &len);
    uint32_t result = setBits(reg, pos, len);
    printf("%u\n", result);
    return 0;
}

Solving Approach