82. Structures-i

Question.1

A developer defines a struct for a communication packet header and expects it to be 7 bytes:

typedef struct {
   uint8_t  start;    // 1 byte
   uint32_t timestamp; // 4 bytes
   uint16_t length;   // 2 bytes
} PacketHeader;

printf("%lu", sizeof(PacketHeader));

On a 32-bit ARM Cortex-M, what does this print?

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7
8
12
10