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Solved–Assignment 4 –Solution

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Questions (40 points) Write a function int cryptic calculator(void *payload) Where: If the first byte in payload is a character ’*’ representing the multiplication operation, you are to return the product of 3 short ints starting at bytes 3, 5 and 7. If the first byte in the payload is a character ’/’ representing division,…

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Questions

  1. (40 points) Write a function int cryptic calculator(void *payload) Where:

If the first byte in payload is a character ’*’ representing the multiplication operation, you are to return the product of 3 short ints starting at bytes 3, 5 and 7.

If the first byte in the payload is a character ’/’ representing division, you are to return the quotient when you divide int starting at byte 5 by short int starting at byte 3. If short int starting at byte 3 is 0, you are to return 0xBAD.

If the first byte is neither ’*’ or ’/’, you are to return 0xBAD.

HINT: Cast payload to an appropriate appropriate structure. Byte 1 is at &payload, byte 3 is at &payload + 2, byte 5 is at &payload + 4 and so on.

  1. (40 points) Write a function: void my memcpy(void *dst, void *src, unsigned int num bytes) that copies num bytes from memory pointed to by src to memory pointed to by dst. HINT: Loop num bytes times and copy one char at a time from src to dst.

  1. (20 points) Write a function: void swap strs(char *s1, char *s2) that swaps two character strings at s1 and s2. Assume both strings s1 and s2 to be of same length.