Page 262 - Computer_Science_F5

The following Program Example 4.17 (e) Relational operators
demonstrates the use of increment and decrement Sometimes, in programming,
operators. The output is shown in Figure 4.33. we need to compare two values

to know if they are equal or not, Chapter Four: Object oriented programming with C++
Program Example 4.17:
FOR ONLINE READING ONLY
greater than or less than. The
Increment and decrement operators values can either be variables,

constants or expressions.
#include<iostream>
using namespace std;
int main() C++ programming language
{ evaluates the comparison
int x = 25; between two values using
cout<<”x++ = “<<x++<<endl; relational operators. Relational
cout<<”x-- = “<<x--<<endl; operators can help you in
cout<<”++x = “<<++x<<endl;
cout<<”--x = “<<--x<<endl; making the decision. You
return 0; can use relational operators
} to compare the height of two

trees, the ages of two students
Output:
or the prices of two items.
Usually, the result obtained
after evaluating relational
operators is either true or false.
Table 4.10 shows relational

operators, their meaning,
Figure 4.33: Output of the program
examples and return values.

Table 4.10: Relational operators

Operator Meaning Example Evaluation Return value
< less than 16 < 20 True 1

< = less than or equal to 10 < = 10 True 1
> greater than 5 > 11 False 0

> = greater than or equal to 45 > = 28 True 1
= = equal to 6 = = 7 False 0

! = is not equal to 8! = 8 False 0

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Student’s Book Form Five

Computer Science Form 5.indd 253 23/07/2024 12:33