Java and C++ are the two most popular programming languages. Although they have many differences, there are quite a lot of similarities between them.
Similarities between Java and C++
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 executation of program is initiated from main() function.
Example –
In both Java and C++ main() function is there but there syntax are 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++, but 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;
No significant difference.
Example –
a +=5; b =5*4;