Home »
C++ programming language
A simple example of Ternary Operator in C++ (check whether a year if Leap or not)
Example of Ternary/Conditional Operator in C++: using Example to check Leap year, we will learn what Ternary operator is, how it is works in C/C++?
Ternary Operator
It is called Ternary Operator because it has 3 operands to operate a statement. It is also known as Conditional Operator or ? : (Questions Mark and Colon) Operator.
The three operands are:
- Operand1: Condition_part (Here, we write a conditional statement to validate).
- Operand2: True_part (Here, we write statement to execute if conditional part is true).
- Operand3: False_part (Here, we write statement to execute if conditional part is false).
Syntax:
Operand1? Operand2: Operand3;
In this program, we are using Ternary (Conditional) operator to check whether a Year is Leap Year or not.
Example/program: Given a year and we have to check whether it is Leap year or not using Ternary Operator/Conditional Operator.
Consider the program:
/*
C++ program to check whether entered year is Leap year or not
*/
#include <iostream>
using namespace std;
int main()
{
int year;
//input a year
cout<<"\nEnter year: ";
cin>>year;
/*
if( (year%100!=0 && year%4==0) || (year%400==0) )
cout<<year<<" is a Leap year."<<endl;
else
cout<<year<<" is not a Leap year."<<endl;
*/
//using TERNARY OPERATOR/CONDITIONAL OPR/?: OPR
( (year%100!=0 && year%4==0) || (year%400==0) ) ?
cout<<year<<" is Leap year."<<endl :
cout<<year<<" is not a Leap year."<<endl;
return 0;
}
Output
First run:
Enter year: 2000
2000 is Leap year.
Second run:
Enter year: 2017
2017 is not a Leap year.
Third run:
Enter year: 1900
1900 is not a Leap year.
Fourth run:
Enter year: 2016
2016 is Leap year.
program using goto to run program until input year is not 0
/*
C++ program to check whether entered year is Leap year or not
*/
#include <iostream>
using namespace std;
int main()
{
int year;
//Label to run again program from here
INIT:
//input a year
cout<<"\nEnter year (ENTER 0 for exit...): ";
cin>>year;
/*
if( (year%100!=0 && year%4==0) || (year%400==0) )
cout<<year<<" is a Leap year."<<endl;
else
cout<<year<<" is not a Leap year."<<endl;
*/
//using TERNARY OPERATOR/CONDITIONAL OPR/?: OPR
( (year%100!=0 && year%4==0) || (year%400==0) ) ?
cout<<year<<" is Leap year."<<endl :
cout<<year<<" is not a Leap year."<<endl;
//////////////
//condition to go to label INIT or end of the program
if(year!=0)
goto INIT;
//////////////
return 0;
}
Output
Enter year (ENTER 0 for exit...): 2000
2000 is Leap year.
Enter year (ENTER 0 for exit...): 2017
2017 is not a Leap year.
Enter year (ENTER 0 for exit...): 1900
1900 is not a Leap year.
Enter year (ENTER 0 for exit...): 2016
2016 is Leap year.
Enter year (ENTER 0 for exit...): 0
0 is Leap year.