Comments in Programming Language

A comment is a piece of descriptive text which explains some aspect of a program. Program comments are totally ignored by the compiler and are only intended for human readers.

C++ provides two types of comment delimiters:

· Anything after // (until the end of the line on which it appears) is considered a comment.

· Anything enclosed by the pair /* and */ is considered a comment.

Comments should be used to enhance (not to hinder) the readability of a program.

The following two points, in particular, should be noted:

· A comment should be easier to read and understand than the code which it tries to explain. A confusing or unnecessarily-complex comment is worse han

no comment at all.

· Over-use of comments can lead to even less readability. A program which contains so much comment that you can hardly see the code can by no means be considered readable.

· Use of descriptive names for variables and other entities in a program, and proper indentation of the code can reduce the need for using comments. The best guideline for how to use comments is to simply apply common sense.

Comments

Object-Oriented Programming and JAVA Programming Language

Object-Oriented Programming and: Object-oriented programming (OOP) is a programming paradigm using "objects" – data structures consisting of data fields and methods together with their interactions – to design applications and computer programs. Programming techniques may include features such as data abstraction, encapsulation, messaging, modularity, olymorphism, and inheritance. Many modern programming languages now support OOP, at least as an option. JAVA Programming Language: Object-oriented programming is at the core of Java. In fact, all Java programs are object-oriented, this isn’t an option the way that it is in C++, for example. OOP is so integral to Java that you must understand its basic principles before you can write even simple Java programs. Therefore, this chapter begins with a discussion of the theoretical aspects of OOP.

DIFFERENCE BETWEEN IDENTIFIER AND KEYWORD

Identifier keyword Identifiers are names that are given to various program elements, such as variable, function and arrays. C take some reserved word called keyword, they have predefine meaning in C. Identifiers consist of letters and digits. Keyword consist only letter. Identifier’s first character must be a letter. Keyword’s all character is letter. Identifiers Upper and lowercase letter is use. Keywords are all lowercase. Upper and lowercase are not equivalent. Upper and lowercase are also not equivalent. Like: X, sum_5, _weather etc. But 4 th is not identifier cause identifier first character must a letter. Like: auto, short, long etc.

Absolute value and Floating-point absolute value function in C Programming Language

Absolute value function in C Programming Language is abs(i), Its return the absolute valu of i. where i is any positive or negative number. It is integer type function. The include file of abs(i) is stslib.h Observe under program: #include<stdio.h> #include<stdlib.h> int main(void) { int a; scanf("%d",&a); printf("%d",abs(a)); } Here I use a integer number. Input it by scanf and print the Absolute value by abs() function. Floating-point Absolute value function in C Programming Language is fabs(i), Its return the absolute valu of i. where i is any positive or negative Floating-point number. It is double integer type function. The include file of fabs(i) is math.h Observe under program: #include<stdio.h> #include<stdlib.h> int main(void) { float a; scanf("%f",&a); printf("%.2f",fabs(a)); } Here I use a integer number. Input it by scanf and print the Floating-point Absolute value b...

Programming, Data Structures & Algorithms

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