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A collection of Advanced Data Science and Machine Learning by Dr Antonio Gulli

By Dr Antonio Gulli

A suite of desktop studying interview questions in Python and Spark

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Extra resources for A collection of Advanced Data Science and Machine Learning Interview Questions Solved in Python and Spark (II): Hands-on Big Data and Machine ... Programming Interview Questions) (Volume 7)

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The value is not defined until you assign a value. Line 7 assigns 20 into variable radius. Similarly, line 4 declares variable area, and line 10 assigns a value into area. The following table shows the value in the memory for area and radius as the program is executed. Each row in the table shows the values of variables after the statement in the corresponding line in the program is executed. This method of reviewing how a program works is called tracing a program. Tracing programs are helpful for understanding how programs work, and they are useful tools for finding errors in programs.

In the program. 2 Special Characters Character Name Description {} Opening and closing braces Denote a block to enclose statements. () Opening and closing parentheses Used with methods. [] Opening and closing brackets Denote an array. // Double slashes Precede a comment line. , sequence of characters). ; Semicolon Mark the end of a statement. The most common errors you will make as you learn to program will be syntax errors. Like common errors any programming language, Java has its own syntax, and you need to write code that conforms to the syntax rules.

Util. Scanner; The wildcard import imports all the classes in a package by using the asterisk as the wildcard. util. *; no performance difference The information for the classes in an imported package is not read in at compile time or runtime unless the class is used in the program. The import statement simply tells the compiler where to locate the classes. There is no performance difference between a specific import and a wildcard import declaration. 3 gives an example of reading multiple input from the keyboard.

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