Indentation in C++ and Python

C++

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Indentation has no effect on the program but make it more organize and reader friendly. The braces or curly brackets makes the statement blocks for the tasks.

if (10 < 20)
        cout<<"10 is less than 20";
else
        cout<<"10 not greater than 20";
        cout<<"This is second line";

Output
10 is less than 20
This is second line


Python

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Indentation makes the statement blocks. No need to use the braces.

if 10 < 20:
        cout<<"10 is less than 20";
else:
        cout<<"10 not greater than 20";
        cout<<"This is second line";

Output
10 is less than 20

The output will be different if the indentation of the above python code is changed as follows.

if 10 < 20:
        cout<<"10 is less than 20";
else:
        cout<<"10 not greater than 20";
cout<<"This is second line";

Output
10 is less than 20
This is second line

Comments in C++ and Python

Comments are put in a program to make it more readable and easy to understand when someone reads it.

C++

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There are two commenting styles

1. Line comment
Put two slashes (//) and whatever is been typed will become a comment and will be ignored by the compiler.

E.g.

int total = 0; // integer variable to store the total value


2. Block comment
This consist two parts: Starting with slash and star (/*) and ending with the reverse order , which is star and a slash (*/). Everything typed between these two symbols become comments and ignored by the compiler. Multiple comment lines can be made with the block comment method.

E.g.

/*-----------------------------
    Author : Randima
    Date   : 2017 January 01
-----------------------------*/


Python

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A line starts with hash symbol (#) is a comment. Unlike block commenting in the C++, hash symbol (#) should be used in every comment line.

E.g.

#    Author : Randima
#    Date   : 2017 January 01

First C++ and Python program

First program

Display Hello World in the terminal

C++

---

#include <iostream>
using namespace std;
int main()
{
        cout<<"Hello World"<<endl;
        return 0;
}

Python

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print("Hello World")