To find the trailing zeros in a given factorial, let us consider the following three examples:
Example 1
Input - 4
Output - 0
Explanation - 4! = 24, no trailing zero.
Factorial 4! = 4 x 3 x 2 x 1 = 24. There is no number 4 in the place of the trailing zero.
Example 2
Input - 6
Output - 1
Explanation - 6! = 720 , has a trailing zero.
Factorial 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720, there is a trailing zero because there is a number 0 in the place of the trailing zero.
Example 3
The input is as follows-
n = 4 n = 5
The output is as follows-
4! The number of trailing zeros is 0## The number of trailing zeros for
#5! is 1ExampleThe following is a C program forfinding the trailing zeros of a given factorial−
Online Demonstration#include <stdio.h> static int trailing_Zeroes(int n){ int number = 0; while (n > 0) { number += n / 5; n /= 5; } return number; } int main(void){ int n; printf("enter integer1:"); scanf("%d",&n); printf("</p><p> no: of trailing zeroe's of factorial %d is %d</p><p></p><p> ", n, trailing_Zeroes(n)); printf("enter integer2:"); scanf("%d",&n); printf("</p><p> no: of trailing zeroe's of factorial %d is %d ", n, trailing_Zeroes(n)); return 0; }OutputWhen the above program is executed, it produces the following results−
enter integer1:5 no: of trailing zeroe's of factorial 5 is 1 enter integer2:6 no: of trailing zeroe's of factorial 6 is 1
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