Question

How are variables declared in c ++

Answer 1

Declare the variables in C++ style. Explanation: In the above program, the variables num and num1 are declared within the program and not at the beginning of the program. Once declared, they are used with cin statement that reads two integers and stores them in the variables num and num1.

Answer 2

C++ is a strongly-typed language, and requires every variable to be declared with its type before its first use. This informs the compiler the size to reserve in memory for the variable and how to interpret its value. The syntax to declare a new variable in C++ is straightforward: we simply write the type followed by the variable name (i.e., its identifier). For example:


int a; float mynumber;



These are two valid declarations of variables. The first one declares a variable of type int with the identifier a. The second one declares a variable of type float with the identifier mynumber. Once declared, the variables a and mynumber can be used within the rest of their scope in the program.
If declaring more than one variable of the same type, they can all be declared in a single statement by separating their identifiers with commas. For example:

 int a, b, c;



This declares three variables (a, b and c), all of them of type int, and has exactly the same meaning as:


int a; int b; int c;



To see what variable declarations look like in action within a program, let's have a look at the entire C++ code of the example about your mental memory proposed at the beginning of this chapter:


// operating with variables #include <iostream> using namespace std; int main () { // declaring variables: int a, b; int result; // process: a = 5; b = 2; a = a + 1; result = a - b; // print out the result: cout << result; // terminate the program: return 0; }4





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