Understanding Structures in C

What is a structure in C?

• A structure in C is a user-defined data type that groups different data types.

• A structure in C is a function that performs calculations.

• A structure in C is a way to define constants.

• A structure in C is a built-in data type for integers.

How do you define a structure in C?

• Structures in C cannot have members.

• A structure in C is defined using the 'struct' keyword, followed by the structure name and its members.

• A structure in C is defined using the 'class' keyword.

• A structure in C is defined with the 'define' keyword.

What is the syntax to declare a structure variable?

• variableName struct StructureName;

• struct StructureName variableName;

• StructureName variableName struct;

• struct variableName StructureName;

Can a structure contain another structure in C?

• Yes, a structure can contain another structure in C.

• A structure can only contain arrays, not other structures in C.

• Structures can only contain primitive data types in C.

• No, a structure cannot contain another structure in C.

What is the difference between a structure and a union in C?

• A structure can only hold one value at a time, while a union can hold multiple values simultaneously.

• A structure is used for dynamic memory allocation, while a union is not.

• A structure can hold multiple values simultaneously, while a union can hold only one value at a time.

• Structures and unions are identical in functionality and usage in C.

How do you access members of a structure?

• Use the semicolon operator (;) for structure variables.

• Access members using the colon operator (:) for structure pointers.

• Use the dot operator (.) for structure variables and the arrow operator (->) for structure pointers.

• Members can only be accessed through a function call.

What is the purpose of the 'typedef' keyword with structures?

• To initialize structure variables.

• To allocate memory for a structure.

• To create an alias for a structure type.

• To define a new structure type.

Can structures have functions as members in C?

• Structures can have function pointers as members.

• Structures can contain methods like classes in C++.

• No, structures cannot have functions as members in C.

• Structures can have inline functions as members.

What is a pointer to a structure?

• A pointer to a structure is a data type that cannot be used in programming.

• A pointer to a structure is a variable that holds a string.

• A pointer to a structure is a variable that holds the address of a structure in memory.

• A pointer to a structure is a type of function.

How do you dynamically allocate memory for a structure?

• struct MyStruct *ptr = new struct MyStruct;

• struct MyStruct *ptr = (struct MyStruct *)calloc(1, sizeof(struct MyStruct));

• struct MyStruct ptr = malloc(sizeof(struct MyStruct));

• struct MyStruct *ptr = (struct MyStruct *)malloc(sizeof(struct MyStruct));