C vs. C++: Differences and Similarities

C is the foundation for C . While C is more widely used for desktop apps and games, it is an excellent option to start with C, especially if you are new to the software world. Read on to know why.

What is C?

C is a high-level structural programming language. Programs written in C are portable. C is still one of the top programming languages today because it is robust. It is used for complex programs like embedded systems, drivers, kernels, system applications, operating systems like Microsoft Windows, Apple OS X, databases like MySQL, and some IoT applications.

C is a compiled language, thus providing a layer of abstraction between the machine code and the program.

A simple C program to add two numbers will look like this.

#include
int main()
{
int a, b, sum;
printf("Enter two numbers to add: ");
scanf("%d%d", &a, &b);
sum = a   b;
printf("nSum of %d and %d is %d", a, b, sum);
return 0;
}

Here is the output:

C programs include stdio.h – the standard input output.

STDIO provides basic input-output functions like printf and scanf. printf is used to print something (message, output) on the console, while scanf is used to take inputs from the console. We are using %d to indicate that the numbers are integers.

If you give decimals, you will get some weird answers. To avoid this, you can use %f. The main() function is the first function that is executed when the program runs. The syntax is very simple – declare the variable types and then use them.

What is C ?

C is based on object-oriented programming principles like abstraction, polymorphism, inheritance, and encapsulation. You can think of C as an extension of C with the concept of classes and objects.

Having objects to store data gave a neat structure to the programs. For example, if you want to store details of a student, you can create a Student class and create attributes like name, age, hobbies, marks etc., under the class. You can create a real student object whenever required!

class Student {
public: 
char name[20];
int age;
float marks;
};

//This will create an object
Student student1 = new Student();

In reality, the object will be created and memory allocated only during runtime.

C provides high performance, which is why it is the most popular choice even today for developing high-performance game engines, embedded systems, browsers, compilers, and graphics-based applications like image processing.

Few databases like MongoDB are written in C . Just like C, C is portable.

Let’s write our previous addition program in C – notice the different functions.

#include 
using namespace std;
int main() {
int a, b;
cout <> a >> b;
int sum = a   b;
cout << a << "   " << b << " = " << sum;
return 0;
}

Note that we are using cout and cin instead of printf and scanf. Also, type declarations can be done anywhere in the program before the variable is used (for example, the variable sum). The print statement is quite simple with just the variable names. Note that we are using the namespace std from the iostream header. std has the methods like cout, in, and many more.

Similarities between C and C

You can say that C is a subset of C . There are many similarities between C and C , be it in the way programs are written or the applications that they are used for. Both are robust, portable, and highly performant. Some important similarities are:

Differences between C and C

C was created to overcome some of the shortcomings of C and is a superset of C. So, any program written in C will work in C – but not vice versa! The main difference between C and C is that C is based on object-oriented principles (OOP) of programming. Also, there is more emphasis on type checking in C . There are also a few more subtle differences as listed below:

Some other important features present only in C are:

• Using namespace keyword, we can create variables of the same name in different namespaces.
• We can use functions inside a structure. Structures can also have access modifiers.
• Supports reference variables.

When to use C or C

This is a very common debate amongst programmers – why should I learn C when I can do everything in C ?

Learning C will give you a solid foundation on data structures, pointers, keywords, concepts of stack, heap, and memory allocation.

Besides that, C is still widely used for high-performance apps, as the C compiler is faster than the C compiler. So, if you want to write chunks of code that do not require objects and classes, virtual functions, or templates, go for C because C might be overkill with its extensive libraries.

Most low-level coding like kernels, operating systems, and databases are still maintained in C, so knowing C will also help you learn C faster.

C is considered one of the fastest and most efficient languages – which is why it is still one of the top programming languages, especially for high-performance applications like game engines, IoT devices, and desktop apps. Many applications use a combination of C and C code – to achieve optimum performance and the benefit of object-oriented programming.

Summary

In this article, we learned the basics of C and C with a simple example program. We discussed the main differences and similarities between both languages and when to use each.

If you are just beginning your software development journey, starting with C will give you a confidence boost, as it is easy and covers all the programming concepts, like data structures, pointers, memory, and so on.

You may be interested in using Geekflare’s online C Compiler and C Compiler.