Even or odd using ternary (conditional) operator

Posted on June 14, 2020

C program to determine whether the number entered by user is even or odd using conditional operator.

Program 

#include<stdio.h>
#include<conio.h>
void main()
{
   int num;

    printf("Enter a number\t: ");
    scanf("%d",&num);
    num%2 == 0 ? printf("Even number") : printf("Odd number");

    getch();
}

Output 

********** Run1 **********

Enter a number	: 8
Even number


********** Run2 **********

Enter a number	: 5
Odd number

Explanation

General Form of Ternary Operator (conditional operator):
(expression_1) ? (expression_2) : (expression_3);

expression_1 is a comparison/conditional argument. If expression_1 results in true then, expression_2 is executed/returned, and if expression_1 results in false then, expression_3 gets executed/returned.



In above program, we check if the user entered number (num) is perfectly divisible by 2 or not. If its perfectly divisible by 2, then it is an even number or else it is an odd number.

Using conditional operator, this is done as follows:
num%2 == 0 ? printf("Even number") : printf("Odd number");



If num%2==0 evaluates to true, then printf("Even number"); statement is executed.
If num%2==0 evaluates to false, then printf("Odd number"); statement is executed.

Program 

#include<stdio.h>
#include<conio.h>
void main()
{
    int num;

    printf("Enter a number\t: ");
    scanf("%d",&num);

    printf("The number is %s",(num%2==0 ? "Even" : "Odd"));

    getch();
}

Output 

********** Run1 **********

Enter a number  : 12
The number is Even


********** Run2 **********

Enter a number  : 11
The number is Odd

Explanation

General Form of Ternary Operator (conditional operator):
(expression_1) ? (expression_2) : (expression_3);

expression_1 is a comparison/conditional argument. If expression_1 results in true then, expression_2 is executed/returned, and if expression_1 results in false then, expression_3 gets executed/returned.



In above program, we check if the user entered number (num) is perfectly divisible by 2 or not. If its perfectly divisible by 2, then it is an even number or else it is an odd number.

Using conditional operator, this is done as follows:
printf("The number is %s",(num%2==0 ? "Even" : "Odd"));



Here, conditional operator is used as an argument in printf() statement.
If num%2==0 evaluates to true, then "Even" statement is returned and printf() statement becomes
printf("The number is %s","Even");
If num%2==0 evaluates to false, then "Odd" statement is returned and printf() statement becomes
printf("The number is %s","Odd");