C和C++之间的相似之处是：
- 这两种语言都有相似的语法。
- 两种语言的代码结构相同。
- 这两种语言的编译是相似的。
- 它们共享相同的基本语法。几乎所有 C 的运算符和关键字也都出现在 C++ 中，并做同样的事情。
- C++ 的语法比 C 稍有扩展，但基本语法是一样的。
- 两者的基本内存模型都非常接近硬件。
- 两种语言中都存在堆栈、堆、文件范围和静态变量的相同概念。
C和C++之间的差异是：
C++可以说是C的超集。C++的主要新增特性是面向对象编程、异常处理和丰富的C++库。
下面是 C 和 C++ 之间的差异表：
| C | C++ |
|---|---|
| C was developed by Dennis Ritchie between the year 1969 and 1973 at AT&T Bell Labs. | C++ was developed by Bjarne Stroustrup in 1979. |
| C does no support polymorphism, encapsulation, and inheritance which means that C does not support object oriented programming. | C++ supports polymorphism, encapsulation, and inheritance because it is an object oriented programming language. |
| C is a subset of C++. | C++ is a superset of C. |
| C contains 32 keywords. | C++ contains 63 keywords. |
| For the development of code, C supports procedural programming. | C++ is known as hybrid language because C++ supports both procedural and object oriented programming paradigms. |
| Data and functions are separated in C because it is a procedural programming language. | Data and functions are encapsulated together in form of an object in C++. |
| C does not support information hiding. | Data is hidden by the Encapsulation to ensure that data structures and operators are used as intended. |
| Built-in data types is supported in C. | Built-in & user-defined data types is supported in C++. |
| C is a function driven language because C is a procedural programming language. | C++ is an object driven language because it is an object oriented programming. |
| Function and operator overloading is not supported in C. | Function and operator overloading is supported by C++. |
| C is a function-driven language. | C++ is an object-driven language |
| Functions in C are not defined inside structures. | Functions can be used inside a structure in C++. |
| Namespace features are not present inside the C. | Namespace is used by C++, which avoid name collisions. |
| Header file used by C is stdio.h. | Header file used by C++ is iostream.h. |
| Reference variables are not supported by C. | Reference variables are supported by C++. |
| Virtual and friend functions are not supported by C. | Virtual and friend functions are supported by C++. |
| C does not support inheritance. | C++ supports inheritance. |
| Instead of focusing on data, C focuses on method or process. | C++ focuses on data instead of focusing on method or procedure. |
| C provides malloc() and calloc() functions for dynamic memory allocation, and free() for memory de-allocation. | C++ provides new operator for memory allocation and delete operator for memory de-allocation. |
| Direct support for exception handling is not supported by C. | Exception handling is supported by C++. |
| scanf() and printf() functions are used for input/output in C. | cin and cout are used for input/output in C++. |
| C structures don’t have access modifiers. | C++ structures have access modifiers. |
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