Which is not a legal variable name?
The following are examples of invalid variable names: age_ (ends with an underscore); 0st (starts with a digit); food+nonfood (contains character “+” which is not permitted)
Which of the following is not a legal variable name in Java?
Answer: Variable name cannot start with a digit. … Explanation: Since only underscore and no other special character is allowed in a variable name, it results in an error.
Which is not a variable name in Java?
Variable names cannot be equal to reserved key words in Java. For instance, the words int or for are reserved words in Java. Therefore you cannot name your variables int or for .
Which of the following variable names are illegal?
A variable name cannot start with a number. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive (age, Age and AGE are three different variables)
What is a valid variable name?
A valid variable name starts with a letter, followed by letters, digits, or underscores. … The maximum length of a variable name is the value that the namelengthmax command returns. You cannot define variables with the same names as MATLAB keywords, such as if or end .
What is variable name?
A Variable name is used to refer to a variable (column of the data matrix) for all commands dealing with data in SPSS. … Variable names must be unique in a Dataset. Variable names are up to 64 characters long and can only contain letters, digits and nonpunctuation characters (except that a period (.) is allowed.
What are the rules of naming variables?
Rules of naming variables
- Name your variables based on the terms of the subject area, so that the variable name clearly describes its purpose.
- Create variable names by deleting spaces that separate the words. …
- Do not begin variable names with an underscore.
- Do not use variable names that consist of a single character.
How do you choose variable names?
The variable name must describe the information represented by the variable. A variable name should tell you specifically in words what the variable stands for. Your code will be read more times than it is written. Prioritize how easy your code is to understand rather than how quickly it is written.
How do you code a variable in Java?
To declare (create) a variable, you will specify the type, leave at least one space, then the name for the variable and end the line with a semicolon ( ; ). Java uses the keyword int for integer, double for a floating point number (a double precision number), and boolean for a Boolean value (true or false).
What is class variable Java?
In object-oriented programming with classes, a class variable is any variable declared with the static modifier of which a single copy exists, regardless of how many instances of the class exist. Note that in Java, the terms “field” and “variable” are used interchangeably for member variable.
What is local variable in Java?
A local variable in Java is a variable that’s declared within the body of a method. Then you can use the variable only within that method. … Local variables are not given initial default values. Thus, you must assign a value before you use a local variable.
What are legal Python names?
Officially, variable names in Python can be any length and can consist of uppercase and lowercase letters ( A-Z , a-z ), digits ( 0-9 ), and the underscore character ( _ ). An additional restriction is that, although a variable name can contain digits, the first character of a variable name cannot be a digit.
Why can’t variables start with numbers?
In C/C++, a variable name can have alphabets, numbers and underscore( _ ) character. Identifiers are the name of variable, constants, functions etc. … We can not specify the identifier which starts with a number because there are seven phases of compiler as follows.