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Data types in C determine the following:
• Range of the data
• Type of the data stored
• Number of bytes it occupies in memory

C supports following data types:
• int – occupies 4 bytes of memory in 32-bit compiler
• float – occupies 4 byes of memory
• double – occupies 8 bytes of memory
• char – occupies 1 byte of memory

int data types in C is used to define integer numbers. It occupies 4 bytes of memory (32-bit C compiler)

				{
                                int amount;
                                amount = 5;
                }

float data type in C is used to define floating type numbers. It occupies 4 bytes of memory (32-bit C compiler)

                {
                                float amount;
                                amount = 1.200000;
                }

double data type is used to store big floating point numbers. It reserves 8 bytes of memory (32-bit C compiler)

                {
                                double amount;
                                amount = 1.200000000000;
                }

char is used to store characters. It occupies 1 byte of memory (32-bit C compiler)

                {
                                char alp;
                                alp = ‘A’;
                }

The modifiers define the amount of storage allocated to the variable.
Following are the four modifiers in C.
· short
· long
· signed
· unsigned

short can be used with int data-type.

long can be used with int and double data-type.

signed and unsigned can be used with both int and char data-types.

Using signed int is redundant as int is signed by default.

Following are the valid combinations of data types and modifiers in C:

Following rule applies:
short int <= int <= long int

float <= double <=long double