By Ellis Horowitz
Deciding on up the place their vintage basics of desktop Algorithms left off, the acclaimed Horowitz/Sahni workforce deals this new identify, to be had in either Pseudocode and C++ types. This well-researched textual content takes a fantastic, theoretical method of the topic and lays a foundation for extra in-depth learn whereas supplying possibilities for hands-on studying. computing device technology Press Pseudocode model
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Extra resources for Computer Algorithms: Pseudocode Version
Operation LOA $]500 BO ]5 Accumulator $1501 $1500 IF $14FF As can be seen above, the operation code is followed by the address which, as always, is stored in reverse order low byte first. The contents of location $1500 are copied into the accumulator when the instruction is executed. Program 14 uses absolute addressing to place an inverse A on the screen; note that it is not printed but stored into screen memory. Program 14 10 20 REM ** ABSOLUTE ADDRESSING CODE = 768 ** 51 30 40 50 60 80 90 100 110 120 130 140 150 FOR LOOP = 0 TO 5 READ BYTE POKE CODE + LOOP, BYTE NEXTLOOP REM ** M/C DATA ** DATA 169,1 REM $A9, SOl DATA 141,80,04 REM $8D, 550, $04 DATA 96 : REM $60 -LDA #SOl -STA 1104 -RTS HOME PRINT: PRINT: PRINT CALL CODE The meaning of each line is as follows: Lines 20-60 Line 90 Line 100 Line 110 Lines 130-140 Line 150 Assemble machine code.
Store accumulator's contents at 1792 + X. Decrement X register. IF X< >0 then go back. Back to BASIC. Clear screen and print title. Wait for a key to be pressed. Execute machine code. When RUN, the message of line 170 is printed on to the screen. The program then waits for a key to be pressed before calling the machine code. The X register acts as the offset counter and is initialized in line 90. to the accumulator, and then stored back into screen memory at 1792 + X; m both mstances absolute indexed addressing is used.
On pressing RETURN, the first program address is displayed followed by a dollar sign ($). All you now have to do is type in the hex digits. After you type the second digit, the value of the byte is calculated and then POKEd into memory. The next address is then 28 displayed. The program checks for (and ignores) non-hex characters. To quit the program at any time, just type'S' (for STOP). 4 shows the result of a typical run of the program. Once the machine code has been entered, it can be tested by using the CALL command followed by the address (in decimal) of the first byte of the machine code program.
Computer Algorithms: Pseudocode Version by Ellis Horowitz
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