Exercises on equivalence class division and causality diagram

First, equivalence class division:

Example: an input box that allows 1 to 6 English characters or numbers, ending with OK. Valid equivalence classes:

Length: 1 to 6

Character: a-z,a-z,0-9

Invalid equivalence class

Length: 0,7

Characters: English/numeric characters, control characters, punctuation

From the above:

< Span style= "FONT-SIZE:14PX;" > enter	valid equivalence class &NBSP;	invalid equivalence class
	length is 1 to 6 bits consists of characters (A-Z, A-Z) and Numbers (0-9)	length >6 null space control characters punctuation

Test Case:

Number	User name	Expected output
1	User01	Normal
2	User	Error output
3	User00011111	Error output
4		Error output
5	Us 01	Error output
6	us01#	Error output
7	US01,	Error output

Second, cause and effect diagram:

Example: Product Description: There is a vending machine software that handles boxed drinks with a unit price of 1.5 yuan. If you invest 1.5 yuan coins, press "Cola", "Sprite", or "black tea" button, the corresponding drink will be sent out. If you invest in a 2-dollar coin, return the 5-point coin at the same time you send the drink.

Analysis:

Reason: ① put 1.5 yuan coins, ② put 2 yuan coins; ③ Press "Cola" button; ④ Press "Sprite" button; ⑤ Press "black tea" button. Middle Status: ① has been cast, ② has been button. Results: ① returned 5 cents, ② sent "cola" drink ③ Sent "sprite" Drink, ④ sent "black tea" drink.

Exercises on equivalence class division and causality diagram