Types of Comments in Java
- Single-line Comments. As the name suggests, it is for the beginners and is in a single line Java comments.
- Multi-line Comments.
- Documentation Comments.
The definition of a comment is a statement or remark. An example of a comment is a statement released in the paper that someone made about a scandal going on.
Comments are text notes added to the program to provide explanatory information about the source code. They are used in a programming language to document the program and remind programmers of what tricky things they just did with the code and also helps the later generation for understanding and maintenance of code.
If the code is already simple and obvious, there's no need to add a comment. Still, there are times when no matter what you do to the code itself, a clarification comment is still warranted. Usually this happens when you need to add some context to a non-intuitive solution.
To get the most out of commenting on F1 Fanatic, here are ten quick and easy tips on how to write a great comment.
- Read the article.
- Respond to the article.
- Read the other comments.
- Make it clear who you're replying to.
- Use the return key.
- Avoid sarcasm.
- Avoid unnecessary acronyms.
- Use facts.
Multiline comments are used for large text descriptions of code or to comment out chunks of code while debugging applications. Comments are ignored by the compiler.
Comments in Python begin with a hash mark ( # ) and whitespace character and continue to the end of the line. Because comments do not execute, when you run a program you will not see any indication of the comment there. Comments are in the source code for humans to read, not for computers to execute.
End-of-Line Comments
| Language | Comment Syntax |
|---|
| Assembly Languages | ; (semicolon) |
| Ada, mySQL | -- (two dashes) |
| C++/Java | // (two slashes) |
| FORTRAN 90 | ! (exclamation mark) |
C Keywords
| auto | double | int |
|---|
| break | else | long |
| case | enum | register |
| char | extern | return |
| continue | for | signed |
The first line of the program #include <stdio. h> is a preprocessor command, which tells a C compiler to include stdio. h file before going to actual compilation. The next line int main() is the main function where the program execution begins.
"Identifiers" or "symbols" are the names you supply for variables, types, functions, and labels in your program. You cannot use keywords (either C or Microsoft) as identifiers; they are reserved for special use. You create an identifier by specifying it in the declaration of a variable, type, or function.
A comment starts with a slash asterisk /* and ends with a asterisk slash */ and can be anywhere in your program. Comments can span several lines within your C program. Comments are typically added directly above the related C source code.
Single-line Comment ExamplesSingle-line comments allow narrative on only one line at a time. Single-line comments can begin in any column of a given line and end at a new line or carriage return. The // character sequence marks the text following it as a single-line comment.
1. Documentation section: The documentation section consists of a set of comment lines giving the name of the program, the author and other details, which the programmer would like to use later. Basically Header files that are required to execute a C program are included in this section.
Advertisements. Constants refer to fixed values that the program may not alter during its execution. These fixed values are also called literals. Constants can be of any of the basic data types like an integer constant, a floating constant, a character constant, or a string literal.
Data Types in C
| Types | Data Types |
|---|
| Basic Data Type | int, char, float, double |
| Derived Data Type | array, pointer, structure, union |
| Enumeration Data Type | enum |
| Void Data Type | void |
printf() function in C language:In C programming language, printf() function is used to print the (“character, string, float, integer, octal and hexadecimal values”) onto the output screen.
C variable is a named location in a memory where a program can manipulate the data. This location is used to hold the value of the variable. The value of the C variable may get change in the program. C variable might be belonging to any of the data type like int, float, char etc.
The language has been given the name C because it succeeds another language called B. C is one of the most popular computer programming languages which has existed since the last 44 years. It was created by the famous American programmer Dennis Ritchie – with the help of Ken Thompson – while working at Bell Labs.
The printf() function is used to display output and the scanf() function is used to take input from users. The printf() and scanf() functions are commonly used functions in C Language. These functions are inbuilt library functions in header files of C programming.
An operator is a symbol that tells the compiler to perform specific mathematical or logical functions. C language is rich in built-in operators and provides the following types of operators − Arithmetic Operators. Relational Operators. Logical Operators.
Which two are the correct syntax for adding comments? Start with two slashes (//). End with two slashes (//). Start with two slashes and a star (//*).
Because C's comments start and end with specific characters, you cannot put one comment inside another. This is known as nesting. Nested comments can cause errors in your code, so while you're programming, keep track of where comments start and end. If you stick one comment inside another, something bad happens.
Back-End Programming Questiondp is initialized int value of i. This discussion on Which of the following is illegal? a)int *ip;b)string s, *sp = 0;c)int i; double* dp = &i;d)int *pi = 0;Correct answer is option 'C'.
Single-line comments (informally, C++ style), start with // and continue until the end of the line. If the last character in a comment line is a the comment will continue in the next line. Multi-line comments (informally, C style), start with /* and end with */ .
if, else, switch, case, default – Used for decision control programming structure. break – Used with any loop OR switch case. int, float, char, double, long – These are the data types and used during variable declaration. for, while, do – types of loop structures in C.
Why can typecasting be dangerous? Some conversions are not defined, such as char to int. You might permanently change the value of the variable. You might temporarily lose part of the data - such as truncating a float when typecasting to an int.
When we say Output, it means to display some data on screen, printer, or in any file. C programming provides a set of built-in functions to output the data on the computer screen as well as to save it in text or binary files.
Single-line comments start with two forward slashes ( // ). Any text between // and the end of the line is ignored by Java (will not be executed).
What will happen when the structure is declared? Explanation: While the structure is declared, it will not be initialized, So it will not allocate any memory. Explanation: The structure declaration with open and close braces and with a semicolon is also called structure specifier.
Originally Answered: Why is C called a case sensitive programming language? Because it is aware of lower and upper case. This means that “myCar”, “MyCar” and “mycar” are three distinct tokens.
A header file is a file containing C declarations and macro definitions (see Macros) to be shared between several source files. You request the use of a header file in your program by including it, with the C preprocessing directive ' #include '.
