Skip to main content

Operators in C++ Part I

C++ has a vast range of operators, in fact C++ has greater number of operators than most other programming languages.

Operators in C++ are divided into categories namely arithmetic, relational, logical, conditional, bitwise etc. according to the type of operation they perform.

Arithmetic Operators in C++

+, - ,*, /, % are all arithmetic operators. You should not be having any problems with the first four operators (they have their normal meaning), regarding the last one, it is known as the Modulus operator. It divides two operands (data, variable) and gives the remainder of the two upon division.

Increment (++) & Decrement (--) Operators

The increment operator acts on one operator to increase its value by one while the decrement operator does the opposite.

Prefix (++var) and postfix (var++) are the two types of increment/decrement operators. Both does the same arithmetic operation to the operand but the value of the variable in the expression is evaluated differently in different cases.

In case of prefix version, the operation (whether increment or decrement) is first performed on the variable and then evaluated with the updated value. While in case of postfix, the value of the variable is first evaluated (old value) and then updated as per the operation.

   //Program to illustrate prefix and postfix operators
   #include<iostream.h>
   void main(void)
   {
   int var=10;
   cout<<"prefix: "<<++var<<endl;//output is 11
   cout<<"postfix: "<<var++<<endl;//output is 11 again
   //since var is first evaluated then incremented
   cout<<"value of var: "<<var<<endl;//output is    12
   }

Relational Operators

Relational operators determine the relation among the different operands. There are six types of relational operators in C++, which are:

> (greater than) >+ (greater than or equal to) < (lesser than) <= (lesser than or equal to) == (equal to) != (not equal to)

These operators return True (1) and False (0) values in the expression.

   //Program to illustrate relational operators
   #include<iostream.h>
   void main(void)
   {
   int a=5,b=10,c=15,r;
   r=a<b;
   cout<<r;//true (1)
   r=(b==c);
   cout<<r;//false (0)
   r=(a!=b);
   cout<<r;//true (1)
   }

One thing to note here is that, = and == are different, = is an assignment operator while == is a relational operator which checks whether two operands are equal or not.

I do not think there is any need to discuss about these operators in detail (they have their usual meaning).

Popular posts from this blog

Fix For Toshiba Satellite "RTC Battery is Low" Error (with Pictures)

RTC Battery is Low Error on a Toshiba Satellite laptop "RTC Battery is Low..." An error message flashing while you try to boot your laptop is enough to panic many people. But worry not! "RTC Battery" stands for Real-Time Clock battery which almost all laptops and PCs have on their motherboard to power the clock and sometimes to also keep the CMOS settings from getting erased while the system is switched off.  It is not uncommon for these batteries to last for years before requiring a replacement as the clock consumes very less power. And contrary to what some people tell you - they are not rechargeable or getting charged while your computer or laptop is running. In this article, we'll learn everything about RTC batteries and how to fix the error on your Toshiba Satellite laptop. What is an RTC Battery? RTC or CMOS batteries are small coin-shaped lithium batteries with a 3-volts output. Most laptops use

The Best Way(s) to Comment out PHP/HTML Code

PHP supports various styles of comments. Please check the following example: <?php // Single line comment code (); # Single line Comment code2 (); /* Multi Line comment code(); The code inside doesn't run */ // /* This doesn NOT start a multi-line comment block /* Multi line comment block The following line still ends the multi-line comment block //*/ The " # " comment style, though, is rarely used. Do note, in the example, that anything (even a multi-block comment /* ) after a " // " or " # " is a comment, and /* */ around any single-line comment overrides it. This information will come in handy when we learn about some neat tricks next. Comment out PHP Code Blocks Check the following code <?php //* Toggle line if ( 1 ) {      // } else {      // } //*/ //* Toggle line if ( 2 ) {      // } else {      // } //*/ Now see how easy it is to toggle a part of PHP code by just removing or adding a single " / " from th

Designing a Simple Order Form Application in PHP

Ok guys, for this post we’re going to create a simple yet complete order form page. Order forms are used on many sites to take customers order online. Order forms should have the capability to take orders from visitors regarding what items they want to purchase and store the information for further processing. For this post’s example, we are going to create an order form for a Book Seller. The form will be designed to take order of five different items (books). Our order form application should be able to take order of five different items in any separate quantities tht user wants, it should also ask for shipping address and name of the customer. It should then store the information provided in a file along with the date and time order was placed. The application should also be able to take any number of orders and store them all linearly for further human processing. For this, we need a front end of a HTML form to which the user would interact a