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Sia ? 3 years, 5 months ago
| Classes are of reference types. | Structs are of value types. |
| All the reference types are allocated on heap memory. | All the value types are allocated on stack memory. |
| Allocation of large reference type is cheaper than allocation of large value type. | Allocation and de-allocation is cheaper in value type as compare to reference type. |
| Class has limitless features. | Struct has limited features. |
| Class is generally used in large programs. | Struct are used in small programs. |
| Classes can contain constructor or destructor. | Structure does not contain parameter less constructor or destructor, but can contain Parameterized constructor or static constructor. |
| Classes used new keyword for creating instances. | Struct can create an instance, with or without new keyword. |
| A Class can inherit from another class. | A Struct is not allowed to inherit from another struct or class. |
| The data member of a class can be protected. | The data member of struct can’t be protected. |
| Function member of the class can be virtual or abstract. | Function member of the struct cannot be virtual or abstract. |
| Two variable of class can contain the reference of the same object and any operation on one variable can affect another variable. | Each variable in struct contains its own copy of data(except in ref and out parameter variable) and any operation on one variable can not effect another variable. |
Posted by Gayathri Seetharaman 7 years, 1 month ago
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Sia ? 3 years, 5 months ago
Const is a declaration of constant, compiler will do appropriate checks during the compile time
#define is a macro compiler will see a value.
Speaking in terms of memory const declaration could be more efficient:
const short x =3D 1;=20
// this will allocate 16 bits for x (actually it depends on the machine, I assume unix platform with 32 bits integers)
#define x (short)1=20
// this will probably allocate 32 bits to hold the constant 1.
Use const instead of #define mainly because of compiler checks. And inline functions instead of macros as well. Preprocessor is the obsolete remnant from early C days, there’s no use of it in the oop environment.
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Sonam Bali 7 years, 1 month ago
SQL stands for Structured Query Language. SQL is used to communicate with a database.
Posted by Pankaj Pandey 7 years, 2 months ago
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Ashish Singla 7 years, 2 months ago
python is a computer programming language like c++, c, java etc.
moreover google is the best platform to ask any query.
Posted by Ritesh Kumar 7 years, 2 months ago
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Amar Kumar 7 years, 2 months ago
A memory leak is a type of resource leak that occurs when a computer program incorrectly manages memory allocations in such a way that memory which is no longer needed is not released. A memory leak is the gradual loss of available computer memory when a program (an application or part of the operating system) repeatedly fails to return memory that it has obtained for temporary use.
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