Designing an algorithm
Algorithm design option one - flow diagram
Algorithm design option two - pseudo-code
wet_calc ← 1.5 OUTPUT “What speed is the go-kart travelling at?”
speed ← USERINPUT
WHILE (speed IS NOT integer) OR (speed < 10) OR(speed > 50) DO OUTPUT “Speed must be a whole number between 10 and 50. Try again.” speed ← USERINPUT
ENDWHILE OUTPUT “Is the ground wet? (yes/no)”
wet_ground ← USERINPUT IF wet_gound = “yes” THEN braking_dist ← (speed * 5)* wet_calc
ELSE braking_dist ← speed * 5
ENDIF
OUTPUT “The braking distance is: “ + braking_dist + “m”Testing table
Tests will be required to test that the final program runs correctly.
| Test no | Description | Test data | Test type | Expected outcome |
| 1 | Calculate normal speed on dry ground | 20, no | Normal | 100m |
| 2 | Calculate normal speed on wet ground | 20, yes | Normal | 150m |
| 3 | Borderline calculate normal speed on dry ground | 10, no | Boundary | 50m |
| 4 | Borderline calculate normal speed on wet ground | 10, yes | Boundary | 75m |
| 5 | Test rejected input - below minimum | 5, yes | Erroneous | Asked to input again |
| 6 | Test rejected input - above maximum | 100, yes | Erroneous | Asked to input again |
| 7 | Test rejected input - not a number | ten, yes | Erroneous | Asked to input again |
| Test no | 1 |
|---|---|
| Description | Calculate normal speed on dry ground |
| Test data | 20, no |
| Test type | Normal |
| Expected outcome | 100m |
| Test no | 2 |
|---|---|
| Description | Calculate normal speed on wet ground |
| Test data | 20, yes |
| Test type | Normal |
| Expected outcome | 150m |
| Test no | 3 |
|---|---|
| Description | Borderline calculate normal speed on dry ground |
| Test data | 10, no |
| Test type | Boundary |
| Expected outcome | 50m |
| Test no | 4 |
|---|---|
| Description | Borderline calculate normal speed on wet ground |
| Test data | 10, yes |
| Test type | Boundary |
| Expected outcome | 75m |
| Test no | 5 |
|---|---|
| Description | Test rejected input - below minimum |
| Test data | 5, yes |
| Test type | Erroneous |
| Expected outcome | Asked to input again |
| Test no | 6 |
|---|---|
| Description | Test rejected input - above maximum |
| Test data | 100, yes |
| Test type | Erroneous |
| Expected outcome | Asked to input again |
| Test no | 7 |
|---|---|
| Description | Test rejected input - not a number |
| Test data | ten, yes |
| Test type | Erroneous |
| Expected outcome | Asked to input again |
The problem has now been fully decomposed and an algorithm has been designed.
