Difference between C and C++

Sr. No.	CLanguage	C++ Language
1	C is a procedural programming Language.	C++ is a multi-paradigm language which means it is procedural as well as object oriented language.
2	In C, importance is given to the steps or procedure of the program.	C++ focuses on the data rather than the process.
3	Data is not secure because oops feature such as data hiding etc. are not present in C.	Data is secure because it supports oops concepts.
4	C is a low-level Language.	It is Middle level Language.
5	C uses the top-down approach .Program is formulated step by step, each step is processed into detail.	C++ uses the bottom-up approach. In C++ base elements are

Difference Between Structure and Union

Characteristics	Structure	Union
Definition	A structure is a collection of variables under a single name. These variables can be of different types, and each has a name which is used to select it from the structure.	A union is a special data type that enables to store different data types in the same memory location. You can define a union with many members, but only one member can contain a value at any given time
Declaration	typedef struct {           char name[64];           char course[128];           int age;           int year;   } student;	union Data { int i; float f; char str[20]; } data;
Memory Allocation	In a structure, all of its data members are stored in contiguous memory locations. The size of an object of a struct is, therefore, the size of the sum of all its data members. Example for Structure: struct tech { char p; int x; float Q; int y; }D; memory allocated for D will be  1+2+4+2= 9 bytes	A union is a class all of whose data members are mapped to the same address within its object. The size of an object of a union is, therefore, the size of its largest data member.