This operator evaluates a boolean expression and assign the value based on the result.

variable num1 = (expression) ? value if true : value if false

Using Java

result = num3 < (num1 < num2 ? num1:num2) ? num3:(num1 < num2 ? num1:num2);
Here is the complete program:

import java.util.Scanner;
public class JavaExample 
{
    public static void main(String[] args) 
    {
        int num1, num2, num3, result, temp;
        /* Scanner is used for getting user input. 
         * The nextInt() method of scanner reads the
         * integer entered by user.
         */
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter First Number:");
        num1 = scanner.nextInt();
        System.out.println("Enter Second Number:");
        num2 = scanner.nextInt();
        System.out.println("Enter Third Number:");
        num3 = scanner.nextInt();
        scanner.close();
        
        /* In first step we are comparing only num1 and
         * num2 and storing the smallest number into the
         * temp variable and then comparing the temp and
         * num3 to get final result.
         */
        
        temp = num1 < num2 ? num1:num2;
        result = num3 < temp ? num3:temp;
        System.out.println("Smallest Number is:"+result);
    }
}
Output:

Enter First Number:
67
Enter Second Number:
7
Enter Third Number:
9
Smallest Number is:7