Desk Chekcing Algorithms
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The document describes a process of desk checking an algorithm by stepping through it line-by-line and updating a table with the values of all variables after each step. It begins by listing the components that change values in the algorithm. It then demonstrates this process on a sample algorithm, walking through each line and noting the resulting values in the table to verify the logic and output.
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Desk Chekcing Algorithms
- 1. Desk Checking Kelly Bauer
- 2. Desk checking, given all values BEGIN RandProg Go through the algorithm, and list A=3 as headings, all the components B=4 that change values in the C=5 algorithm. Counter=0 Number=20 WHILE Number> Counter A=A+1 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 3. Desk checking, given all values BEGIN RandProg Go through the algorithm, and list A=3 as headings, all the components B=4 that change values in the C=5 algorithm. Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 4. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 5. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 6. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 7. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 8. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 9. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B Print C Counter= Counter+B ENDWHILE END RandProg
- 10. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 Print C Counter= Counter+B ENDWHILE END RandProg
- 11. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 Print C Counter= Counter+B ENDWHILE END RandProg
- 12. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 10 Print C Counter= Counter+B ENDWHILE END RandProg
- 13. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 10 10 Print C Counter= Counter+B ENDWHILE END RandProg
- 14. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 10 5 10 Print C Counter= Counter+B ENDWHILE END RandProg
- 15. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 10 5 10 Print C 5 Counter= Counter+B ENDWHILE END RandProg
- 16. Desk checking, given all values BEGIN RandProg Go through the algorithm line by A=3 line and add the results of each B=4 line to the table. C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 10 5 10 Print C 5 6 16 9 16 Counter= Counter+B ENDWHILE END RandProg
- 17. Desk checking, given all values BEGIN RandProg And so on until you have run A=3 through the entire program B=4 C=5 Counter=0 Number=20 A B C Counte Numbe Print WHILE Number> Counter r r A=A+1 3 4 5 0 20 B=B+1 C=C+B 4 5 10 5 10 Print C 5 6 16 9 16 Counter= Counter+B 6 7 23 32 23 ENDWHILE END RandProg
- 18. Desk Checking Variable values
- 19. BEGIN So, what do you need Read Number 1, Read to test? Number 2 IF Difference <0 THEN CRITICAL VALUES Print “First number is lower” Set 1: Large number, ELSE small number Print “Second Number is lower” Set 2: Small number, END IF large Number END Set 3: Same Numbers
- 20. Set 1: Large Number, Small Number BEGIN Read Number 1, Read Number 2 IF Difference <0 THEN Print “First number is lower” ELSE Print “Second Number is lower” END IF Num1 Num2 Differenc Output e END 3 1 2 Second Number is lower
- 21. Set 2: Small Number, Large Number BEGIN Read Number 1, Read Number 2 IF Difference <0 THEN Print “First number is lower” ELSE Print “Second Number is lower” END IF Num1 Num2 Differenc Output e END 1 2 -1 First Number is lower
- 22. Set 3: Same Numbers BEGIN Read Number 1, Read Number 2 IF Difference <0 THEN Print “First number is lower” ELSE Print “Second Number is lower” END IF Num1 Num2 Differenc Output e END 3 3 0