A C++ program is written in a human-readable form which is not understood by the machine.

A C++ compiler translates the human-readable source code into machine code.

In the example, we compile using g++. The source file first.cpp is converted to an executable machine file a.out, which is run with the preceeding ./command.

The command to compile a C++ program is g++.

In C++, the execution command is ./.

In C++, when we compile a program an executable file is created. To execute that file we use the command ./.

If name of the executable file is a.out, we will use the command ./a.out.

Single-line comments in C++ are made using two consecutive forward slashes (//). Any text after // on the same line is ignored by the compiler.

In C++, we use // to make single line comments. The comments are ignored by the compiler. They are used for readability of the program.

cout is used to display the output to the standard output. It is followed by the symbols <<, which is then followed by the value to display to the standard output.

The escape sequence \n (the backslash character followed by letter n) will generate a newline, in a C++ string.

In C++, the semicolon ; is used to terminate a statement. Every statement in C++ must be ended with a semicolon (;), and failing to do so will result in errors thrown by the compiler.

C++ is case sensitive for language keywords and variable names.

Comments make the code more readable for others.

In C++ , a comment starts with two forward slashes //, called a single-line comment.

The two slashes order the compiler to ignore everything that follows until the end of the line.

The code example will ignore the // single-line comment and prints the Hello world statement.