Can we declare variable at any place?

You will use the keyword extern to declare a variable at any place. Though you can declare a variable multiple times in your C program, it can be defined only once in a file, a function, or a block of code.

Where we can declare variable in C?

The convention in C is has generally been to declare all such local variables at the top of a function; this is different from the convention in C++ or Java, which encourage variables to be declared when they are first used.

Can you declare variables in an if statement in C?

If you’re new to the syntax that’s used in the code sample, if (int i = 5) { is a perfectly valid way of declaring and defining a variable, then using it inside the given if statement.

Do you need to declare variables in C?

Before you can use a variable in C, you must declare it. These declarations declare global variables that are visible throughout the program (i.e. they have global scope). Use of global variables is almost always a mistake. In the argument list in the header of a function.

What happens when we declare a variable in C++?

Variable Declaration in C++ A variable declaration provides assurance to the compiler that there is one variable existing with the given type and name so that compiler proceed for further compilation without needing complete detail about the variable.

Are variable declared in if statement?

No, variables declared inside an if statement would not be accessible directly outside an if statement because if statements have their own scope.

Are variables in IF statements Local?

We learned that control blocks allow all the variables to be used locally even if they are initialized inside the if block. Variables have a local scope that are defined inside the if statements.

How to initialize a variable?

After declaring variables,we need to assign values to them. This is called variable initialization.

Initialization Syntax: variable_name = value;

‘=’ is the assignment operator. It assigns the value specified on its right side to the variable name on the left.

value should be of the type we have specified in the variable declaration.

How do we declare a function in C?

In C and C++, functions must be declared before the are used. You can declare a function by providing its return value, name, and the types for its arguments. The names of the arguments are optional. A function definition counts as a function declaration.

What are some examples of variables in C?

In C#, there are different types of variables (defined with different keywords), for example: int – stores integers (whole numbers), without decimals, such as 123 or -123 double – stores floating point numbers, with decimals, such as 19.99 or -19.99 char – stores single characters, such as ‘a’ or ‘B’. Char values are surrounded by single quotes string – stores text, such as “Hello World”. String values are surrounded by double quotes

How do you declare an array in C?

Declaring C Arrays. In order to declare an array, you need to specify: The data type of the array’s elements. It could be int, float, char, etc. The name of the array. A fixed number of elements that array may contain. The number of elements is placed inside square brackets followed the array name.