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.
is same as
int j=20, i=10;
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.
is O.K. but
will not work.( find out why ???)