This instruction is used to declare the type of variables
being used in the program. A variable is a location in RAM (main memory) for
temporary storage of intermediate data.
Any variable used in the program must be declared before
using it in any statement. The type declaration statement is written at the
beginning of main() function.
Ex: int bas;
float rs, grosssal;
char name, code;
These are several subtle variations of the type declaration
instruction.
i) While declaring the type of variable we can also
initialize it as shown below:
int i=10, j=25;
float a=1.5, b= 1.99+2.4 * 1.45 ;
ii) The order in
which we define the variables is sometimes important sometimes not.
For exa:
int i=10,j=20;
is same as
int j=20,
i=10;
However,
float a =1.2, b=a+3.1;
is alright, but
float b=a+3.1, a=1.2;
is not.this is because here we are
trying to use a even before defining it.
iii) Similarly
int
a,b,c,d;
a=b=c=10;
is O.K. but
int
a=b=c=d=10;
will not
work.( find out why ???)