How do I use structs in C to emulate classes?

Asked by Last Modified  

2 Answers

Learn C Language

Follow 3
Answer

Please enter your answer

D Subba Rao

Follow below example program: typedef struct object object, *setCoordinates; struct object { float x, y; void (*setCoordinates)(object *self, float x, float y); void (*getYCoordinate)(object *self); void (*getXCoordinate)(object *self); }; void object_setCoordinates(object...
read more
Follow below example program: typedef struct object object, *setCoordinates; struct object { float x, y; void (*setCoordinates)(object *self, float x, float y); void (*getYCoordinate)(object *self); void (*getXCoordinate)(object *self); }; void object_setCoordinates(object *self, float x, float y){ self->x = x; self->y = y; } float object_getXCoordinate(object *self){ return self->x; } float object_getYCoordinate(object *self){ return self->y; } object point; point.setCoordinates = object_setCoordinates; point.getYCoordinate = object_getYCoordinate; point.getXCoordinate = object_getXCoordinate; point.setCoordinates(&point, 1, 2); printf("Coordinates: X Coordinate: %f, Y Coordinate: %f", point.getXCoordinate, point.getYCoordinate); read less
Comments
Dislike Bookmark

Tutor

Classes are structures with a hidden pointer to a table of function pointers called VTable. The Vtable itself is static. When types point to Vtables with the same structure but where pointers point to other implementation, you get polymorphism. It is recommended to encapsulate the calls logic in function...
read more
Classes are structures with a hidden pointer to a table of function pointers called VTable. The Vtable itself is static. When types point to Vtables with the same structure but where pointers point to other implementation, you get polymorphism. It is recommended to encapsulate the calls logic in function that take the struct as parameter to avoid code clutter. You should also encapsulate structures instantiation and initialization in functions (this is equivalent to a C++ constructor) and deletion (destructor in C++). These are good practice anyway. typedef struct { int (*SomeFunction)(TheClass* this, int i); void (*OtherFunction)(TheClass* this, char* c); } VTable; typedef struct { VTable* pVTable; int member; } TheClass; To call the function int CallSomeFunction(TheClass* this, int i) { (this->pVTable->SomeFunction)(this, i); } read less
Comments
Dislike Bookmark

Related Questions

Why does execution of a program in C/C++/Java start from only main?
Main function is calling the other functions of he program and compiler gets this direction while Compiling the code. If it does not find main function then it will also not find the other functions in the code. So, main is required in C program.
Isha
Is C programming necessary to learn to become a software engineer?
C language is starting language for programming, if you will understand the concept of C language then it would be very easy to learn all programming language because somehow concepts are similar
Ujwalajagdale
0 0
7
How and where do I start learning C programming?
To start learning C programming, you can follow a structured approach that includes both theoretical knowledge and practical implementation. Begin with understanding the basics of C, including variables,...
Gaurav
0 0
7
How do I learn C programming effectively? What is the best book?
Let Us C by Yasvant kanetaker and other books by same author on C programming
Sk
0 0
7
Is C language the base for learning C++?
No. C and C++ are two different languages. All most all modern languages are influenced by C language. But we can learn C++ directly without learning C language.
Swathi
0 0
8

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Datatypes in C Language
Data types in C Language Data types specify how we enter data into our programs and what type of data we enter. C language has some predefined set of data types to handle various kinds of data that...

Venkateswararao S.

0 0
0
An Interesting discussion about malloc( ) and calloc( )
What are malloc( ) and calloc( )? Simply putting they are the predefined functions in C language. Malloc( ) and calloc( ) are two such functions which are used for more or less identical purpose and...

Shiladitya Munshi

0 0
0
Necessity of Theory and Practical in Computer Science.
Upon studying a subject both theory and practical are important. Usually many schools concentrate more on theory and the marks not on the practical. Other and opposite kind of people prefer practical...

Ganesa M.

0 0
0
C and C++ programming with memory level debugging
Understanding C and C++ programming by using memory level debugging. Step 1: Understand the Memory map of C executable Step 2: Start memory level debugging using popular IDE Step 3: Find the memory...

Umasankar Natarajan

0 0
0
Understanding Computer Science Concepts with Images and Videos..
All Computer science concepts relating to programming and software development are only virtual. It cannot be practically shown as a hardware parts of a computer. But for better understanding it should...

Ganesa M.

0 0
0

Recommended Articles

Lasya Infotech: An educational Training...

Lasya Infotech is a Hyderabad based IT training institute founded in 2016 by O Venkat. Believing in his innovation, passion and persistence and with a diverse blend of experience, he started his brainchild to deliver exemplary professional courses to aspiring candidates by honing their skills. Ever since the institute envisions...

Read full article >

Brilliant Academy, a reputed B. Tech Tuition...

Brilliant Academy is one of the reputed institutes for B.Tech tuition classes. This institute is specialised in delivering quality tuition classes for B.E, Engineering - all streams and Engineering diploma courses. Incorporated in 2012, Brillant Academy is a brainchild of Mr Jagadeesh. The main motto of the academy is to...

Read full article >

What is Applications Engineering all about?

Applications engineering is a hot trend in the current IT market.  An applications engineer is responsible for designing and application of technology products relating to various aspects of computing. To accomplish this, he/she has to work collaboratively with the company’s manufacturing, marketing, sales, and customer...

Read full article >

Learn Microsoft Excel

Microsoft Excel is an electronic spreadsheet tool which is commonly used for financial and statistical data processing. It has been developed by Microsoft and forms a major component of the widely used Microsoft Office. From individual users to the top IT companies, Excel is used worldwide. Excel is one of the most important...

Read full article >

Find C Language Classes near you
C Language Classes in Bangalore
C Language Classes in Hyderabad
C Language Classes in Delhi
C Language Classes in Pune
C Language Classes in Chennai
C Language Classes in Mumbai
C Language Classes in Kolkata
C Language Classes in Noida
C Language Classes in Gurgaon
C Language Classes in Ghaziabad

Looking for C Language Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you