Decision tables

Questions 1 to 5 of 6

1. 1. Match each word from the lesson with its meaning.

   Choose the matching item for each row.

   ConditionChoose…One line of the table, which is one ruleOne box in the tableThe answer the program gives for one combinationA yes or no question the program asksOutcomeChoose…One line of the table, which is one ruleOne box in the tableThe answer the program gives for one combinationA yes or no question the program asksRowChoose…One line of the table, which is one ruleOne box in the tableThe answer the program gives for one combinationA yes or no question the program asksCellChoose…One line of the table, which is one ruleOne box in the tableThe answer the program gives for one combinationA yes or no question the program asks
2. 2. The cinema table has a Student card column and a Weekend column. Match each cell to the Python condition the lesson gives for it.

   Choose the matching item for each row.

   yes in the Student card columnChoose…nothing, so that condition is left out of the ifstudentnot weekendno in the Weekend columnChoose…nothing, so that condition is left out of the ifstudentnot weekendany in the Weekend column of row 1Choose…nothing, so that condition is left out of the ifstudentnot weekend
3. 3. Put these steps in the order the lesson gives for turning rules written as sentences into a decision table and then into code.

   Use the arrows to put the steps in order.

   1. 1.Write one if with a return for each row, in table order↑↓
   2. 2.Run every combination of the conditions and count the combinations that no row covers↑↓
   3. 3.Ask the person who wrote the rules about any case the sentences leave out↑↓
   4. 4.Turn each sentence into one row of the table, in the same order as the sentences↑↓
4. 4. Put these steps in the order Python follows to find the outcome for one combination of conditions when the table is written as if statements.

   Use the arrows to put the steps in order.

   1. 1.If that row matches, its return value is the answer and no lower row is checked↑↓
   2. 2.If the row does not match, Python moves down to the next row and checks it the same way↑↓
   3. 3.If no row matches, the final raise runs↑↓
   4. 4.Python checks the first row, from top to bottom↑↓
5. 5. A shipping table has three rows: over 50 gives 0 for any customer, not over 50 with a member gives 2, and not over 50 with a non-member gives 5. Why must the over-50 row be first?

   Rows are sorted by price, so the cheapest row always comes firstIt is the most common case, so it is checked first to save timeIt covers every order over 50, member or not, so if a later row came first, a member with a large order would pay 2 instead of 0Python requires rows with any in a cell to come before the others