size allocation

 #include <stdio.h>

int main()

{

    printf ("%lu", sizeof(int));

    return 0;

}

this will give you a value of 4

for x64 architecture

whereas in basis x32 bit architecture

whose values are quite different

char 1 byte

int 2 byte

float 4 byte

double 8 byte

long double 10 byte

//data types

//basic data type:- int, char, float, double. (sub basics are signed, unsigned, long)

//derived data type:- array, pointer, structure, string union

//void data type :- void (empty)

//enumaration data type :- enum