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Chapter 3: Problem 26

Explain why you cannot convert the following if-else-if statement into a switch statement. if (temp == 100) x = 0; else if (population > 1000) x = 1; else if (rate <.1) x = -1;

Short Answer

Expert verified
```cpp if (temp == 100) x = 0; else if (population > 1000) x = 1; else if (rate < .1) x = -1; ``` Answer: The given if-else-if statement cannot be converted into a switch statement because it involves conditions that use relational operators ('>' and '<') and are not based on constant values or simple data types, which are required for switch statements.

Step by step solution

01

Understand the characteristics of switch statements

A switch statement is a type of control statement that allows selecting different code blocks to be executed based on the value of a specific expression. The expression must be of a simple data type (i.e., integer, char, or enumeration) and the cases (code blocks) must be based on constant values. The switch statement cannot use relational operators such as '<' or '>'. Additionally, each case must have a unique value.
02

Analyze the given if-else-if statement

The given if-else-if statement is as follows: if (temp == 100) x = 0; else if (population > 1000) x = 1; else if (rate < .1) x = -1; Here, we have three conditions that determine the value of x, none of which are constant expressions. The first condition checks if temp is equal to 100, while the second and third conditions involve relational operators (population > 1000 and rate < .1).
03

Identify the reason it cannot be converted into a switch statement

The reason why the given if-else-if statement cannot be converted into a switch statement is that the conditions in it do not fulfill the requirements of a switch statement. In particular: 1. The conditions involve relational operators ('>' and '<'), which are not allowed in switch statements. 2. The conditions are not based on constant values or simple data types. Hence, due to these limitations, the given if-else-if statement cannot be converted into a switch statement.

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