All computer languages provide tools for some predefined operators. These tools are known as operators. The various categories of operators are:

> Arithmetic operators

> Relational operators

> Logical operators

Arithmetic Operators

In addition to the four arithmetic operators +, -, *, /, C++ also provides the remainder or the modulo operator represented by the % symbol. The modulo operator returns the remainder when an integer is divided by another. The following program illustrates the usage of the modulo operator.

//Program 1.9
//This program demonstrate the use of modulo operator
#include<iostream.h>
void main()
{
int Var1 = 11, iVar2 = 5, iVar3;
iVar3 = iVar1 % iVar2;
cout<<"The remainder is:"<<iVar3<<endl;
}

The output of Program 1.9 is:

The remainder is: 1

The modulo operator works only with integers.

C++ offers a condensed approach to perform calculations using arithmetic assignment operators which combine an arithmetic operator (+, -, /, %) and the assignment operator(=). The statement,

iCount = iCount + 2;

increments the value of the variable iCount by 2. The above statement can be modified as,

iCount += 2;

using the arithmetic assignment operator (+=).

Other arithmetic assignment operators are: -=, *=, /= and %=.

Relational Operators

Relational operators are used to compare tow values. The result of the comparison is either true(1) or false(0).

Table 1.2 lists the various relational operators.

 

Table 1.2 Relational Operators