COMP1721 - Higher Computing 1B

1. Interpret these hexadecimal constants as signed 16-bit integers.
   • 0x0100
   • 0x002a
   • 0x0aaa
   • 0xffff

2. Write a function which given as argument the opcode of an AVR LSR instruction returns the number of its operand register.

   It should check its argument is indeed the opcode of an LSR instruction and return -1 if it is not.

3. Translate these EMU opcodes to assembler.

   Work out what the program does.

   
   0xe000
   0xe081
   0x2fa0
   0xe7f0
   0xe0e0
   0x9509
   0xe011
   0x0f01
   0xe01a
   0x1b10
   0xf7b1
   0xe080
   0xe7f0
   0xe0e0
   0x9509
   

4. Write EMU assemble to sum the value in the SRAM buyes 600 and 700 and store the result in the SRAM byte at 800.

5. Write a C code which takes reads a single line of input containing words separated by commas, places the words separately in an char[][] array and then prints out the words.

   You can assume there at most 100 words on the line and no word is more than 10 characters long.

6. A bank has a database holding information about customer accounts, stored as an array of structs.

   Note, a single customer may have multiple bank accounts, so an array is needed to holds the amount of money in each account.

   enum {
   	MAX_ACCOUNTS = 5,
   	N_CUSTOMERS = 1000
   };
   
   struct customer {
   	char   name[20];
   	int    numberOfAccounts;
   	double balance[MAX_ACCOUNTS];
   };
   
   struct customer customers[N_CUSTOMERS];
   

   One day, around Christmas, the manager asks you who is the customer with the largest balance in a single account, so that he can send them a nice Christmas card (ok, suspend disbelief). Write a piece of C code that will print the name of the relevant customer.