Java: Compute the number of trailing zeros in a factorial
Java Basic: Exercise-112 with Solution
Write a Java program to compute the number of trailing zeros in a factorial.
Example
7! = 5040, therefore the output should be 1.
Pictorial Presentation:

Sample Solution:
Java Code:
import java.util.Scanner;
public class Example112 {
public static void main(String[] arg) {
Scanner in = new Scanner(System.in); // Create a Scanner object for user input
System.out.print("Input a number: "); // Prompt the user to input a number
int n = in.nextInt(); // Read and store the user's input as 'n'
int n1 = n; // Create a copy of 'n' to preserve the original value
long ctr = 0; // Initialize a variable 'ctr' to count trailing zeros
while (n != 0) {
ctr += n / 5; // Count the number of trailing zeros by dividing 'n' by 5 and accumulating the result
n /= 5; // Reduce 'n' by dividing it by 5 for the next iteration
}
System.out.printf("Number of trailing zeros of the factorial %d is %d ", n1, ctr); // Print the result
System.out.printf("\n"); // Print a new line
}
}
Sample Output:
Input a number : 5040 Number of trailing zeros of the factorial 5040 is 1258
Flowchart:

Java Code Editor:
Previous: Write a Java program to add two numbers without using any arithmetic operators.
Next: Write a Java program to merge two given sorted array of integers and create a new sorted array.
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