UNIT 2 2.3 Variables and Constant Declarations

Question 1

These are identifiers which can be assigned a value within a program.
It has 32 valid characters, and these are letters, digits, and underscore

Answer 1

Variables

Question 2

Syntax:

for variable

Answer 2

Data-type ;

/* list of variables separated by commas.*/

Example
int x, y, z;
char a, b ;
double s;
float ave;
char Sname[30];

Question 3

The process of assigning starting values to the variables It is important to remember that
variables are not initialized automatically

Answer 3

Variables initialization

Question 4

Several Ways to Initialize a Variables:

Answer 4

1. By assigning an assignment statement (=)
   ex:
   x = -1;
   Chl = ‘A’;
2. By using function scanf
   ex:
   scanf(“%d”, &x);
   scanf(“%lf”, &y) ;

3. By assigning values during declaration:
ex:
int x =3;
char y = ‘x’;
double a, b = 100.00;

Question 5

Variables that are initialized only at the start of the program. All of these variables are
initialized to zero if no other initializer is specified.

Answer 5

Global Variables

Question 6

Variables that are initialized each time the function in which they are declared is
entered.

Answer 6

Local Variables