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4. A preprocessor directive must not end with a semicolon. cpp and compile the resulting program. What message does your compiler issue? 5. The body of the function main() must be enclosed in braces {}. cpp and compile the resulting program. What message does your compiler issue? 6. If you are not sure if your compiler conforms to the new C++ standard, write a program that will find out. 7. cpp and compile the program. What happens? 8. cpp and replace all occurrences of cout by std::cout. Recompile the resulting program.

The C++ compiler always stores floating point constants as type double. You can initialize a floating point variable in its declaration with the value of a floating point constant. 0023156; Note that the preceding declaration of fl will usually result in a compiler warning message about possible truncation. 2 for a way to avoid the message. Floating point variables can appear in arithmetic statements in the same way as integer variables. For example, consider the following declarations and assignment.

However, a variable must be declared before it is used. Although not required by C++, we shall adopt the practice of placing each variable declaration at the beginning of main() on a separate line. This improves the readability of our programs and allows us to place a comment after a variable's name to explain its function in the program. In later chapters, we shall discuss when it is appropriate to declare a variable elsewhere in the program. The value of a variable is the data stored at that location in computer memory.