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Chapter 2: Problem 11

Which of the following are not valid cout statements? A) cout \(<<\) "Hello" \(<<\) endl B) cout \(<<\) "Hello" \(<<\ln\) C) cout \(<<\) Hello:

Short Answer

Expert verified
A) cout << "Hello" << endl; B) cout << "Hello" <<\ln; C) cout << Hello; Answer: B) and C) are not valid cout statements in C++.

Step by step solution

01

Examine statement A

First, let's look at statement A: cout \(<<\) "Hello" \(<<\) endl. This statement is using "Hello" as a string and the \(<<\) insertion operator to output the text to the console. endl is a line ending that adds a newline character and flushes the output buffer. This statement is correctly formatted and therefore, it is a valid cout statement.
02

Examine statement B

Now let's examine statement B: cout \(<<\) "Hello" \(<<\ln\). This statement is using "Hello" as a string and the \(<<\) insertion operator to output the text to the console. However, instead of the usual 'endl' for line ending, it uses an incorrect '\ln'. Therefore, this statement is not a valid cout statement.
03

Examine statement C

Finally, let's look at statement C: cout \(<<\) Hello. In this statement, the text "Hello" is not enclosed in double quotes, making it an error in C++ syntax. Strings must be enclosed in double quotes to be correctly interpreted by the compiler. As a result, this statement is not a valid cout statement.
04

Conclusion

In conclusion, the invalid cout statements are B) and C), as they don't follow the proper C++ syntax for output statements.

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