I long thought that in C, all variables had to be declared at the beginning of the function. I know that in C99, the rules are the same as in C++, but what are the variable declaration placement ru...

While all versions of C allow lexical block scope, where you can declare the variables depends of the version of the C standard that you are targeting: C99 onwards or C++ Modern C compilers such as …

Sep 11, 2009 · In C, a declaration merely provides information that a function or variable exists and gives its type. For a function declaration, information about the types of its arguments might be …

Mar 30, 2011 · The * in declaration means that the variable is a pointer to some other variable / constant. meaning it can hold the address of variable of the type. for example: char *c; means that c …

Apr 28, 2014 · After reading the question, I know the differences between declaration and definition. So does it mean definition equals declaration plus initialization?

In case I have a variable that may be used in several sources - is it a good practice to declare it in a header? or is it better to declare it in a .c file and use extern in other files?

The condition in an if or while statement can be either an expression, or a single variable declaration (with initialisation). Your second and third examples are neither valid expressions, nor valid …

The clean, reliable way to declare and define global variables is to use a header file to contain an extern declaration of the variable. The header is included by the one source file that defines the variable …

Dec 18, 2016 · C99 imported the C++ feature that you can intermix local variable definitions with the instructions and you can define variables in the for and while control expressions.

As written in C Standard, a declaration specifies the interpretation and attributes of a set of identifiers and a definition for an object, causes storage to be reserved for that object.