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

    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

Common bit-masking patterns for set

• Application

wow! It is better

// Create mask with 'len' 1s, then shift to desired position and OR
uint32_t mask = ((1U << len) - 1) << pos;

than for-loop