What's the real meaning of memory allocation of different datatypes

Question

Tell me its meaning n also tell why it is necessary in all languages

Answer 1

ok... thanks

Answer 2

We need memory to store the value of variables.Every data type will need different amount of memory to store it's value.

Answer 3

n how much memory allocate by these different data types..like int float char

Answer 4

it depends upon number of bits of operating system

use
INT a;
float b;
cout<<sizeof(a);
cout<<sizeof(b);

you will be knowing the memory allocated in terms of bytes for all types of variables