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^ Cite error: The named reference foo was invoked but never defined (see the help page). Cite error: A list-defined reference with the name "foo" has been invoked, but is not defined in the <references> tag (see the help page ).
The reference may be defined inline or in the reference list. You may have misspelled the reference name, used special characters that look the same but are actually different, or the original named reference is missing (for example, if you just copied and pasted the invoked ref).
A list-defined reference has an invalid name. Ensure the footnote name is formatted properly. More than one use of {} or #tag:ref within list defined references. You can only use {} or #tag:ref once as a list-defined reference.
An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code. [1] In some programming languages, an implicit declaration is provided the first time such a variable is encountered at compile time. In other languages such a usage is considered to be sufficiently ...
In C, variables with static storage duration that are not initialized explicitly are initialized to zero (or null, for pointers). [ 3 ] Not only are uninitialized variables a frequent cause of bugs, but this kind of bug is particularly serious because it may not be reproducible: for instance, a variable may remain uninitialized only in some ...
A snippet of Java code with keywords highlighted in bold blue font. The syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C++. Unlike C++, Java has no global functions or variables, but has data members which are also regarded as global variables.
The blank final, which was introduced in Java 1.1, is a final variable whose declaration lacks an initializer. [9] [10] Previous to Java 1.1, a final variable was required to have an initializer. A blank final, by definition of "final", can only be assigned once. i.e. it must be unassigned when an assignment occurs.
The choice of a variable name should be mnemonic — that is, designed to indicate to the casual observer the intent of its use. One-character variable names should be avoided except for temporary "throwaway" variables. Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters. int i;