What is the use of "sizeof()" operator in c++

Question

When is it used?

Answer 1

sizeof() operator is used to know the size of data type.

Example:
int a;
sizeof(a);
Here after printing, output will be 4, because size of int data type is 4 bytes. Similarly size of float is 8 bytes, double is 16 bytes and so on.

Hope you will understand.

Answer 2

Thanks didi

Answer 3

I understood