Similarities between Java and C++

Java and C++ are the two most popular programming languages. Although they have many differences, there are quite a lot of similarities between them.

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Let us look into the similarities between Java and C++.

1. Comments

Comments are same in C++ and Java. Single line comments are done by // and multiple line comments are done by/*.....*/ .         

Examples have been given below.

2. Main function

In both C++ and Java execution of the program is initiated from the main() function. Example –

In both Java and C++ main() function is there but their syntax is quite different.

public class Java {

    // main() function in Java
    public static void main(String[] args) {                   
        // Write your code here
    }
}          

But in C++ it is quite different

// main() function in C++
int main() {                                                   
// Write your code here
}         

3. Classes And Objects

Java is an object-oriented programming language. C++ also supports classes and objects.

(But C++ is not fully object oriented language, a C++ programs can easily be written without concepts of classes and objects.).Example –

Here we give a simple example of a complex class in C++ and Java.

class Complex{
float re;
float im;
};            

//Note that ‘;’ is not given at the end of classes in Java

4. Control Constructs

Major Control Constructs (for , while loops if etc.) in C++ and Java are identical. Example –

In both Java and C++ loops, if-else statements are as follows:

int fact = 1;

for(int i=1;i<=m;i++)
{

//Computes factorial of a given number m 
fact=fact*m;                
}         

5. Primitive Types

Primitive types in Java are almost the same as that of C++.

(Though there are some differences, such as unsigned int data type is present in C++, Java does not support it. In contrast, Java has bigInteger data type that theoretically has no limit but C++ does not support such data types. Example –

In both C++ and Java primitive types are declared as follows:

int a,b=5;
float c=0.7;         

Relational And Arithmetic Operators

No significant difference.

Example –

a +=5;
b =5*4;        

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