c03b.cpp

《C++程序设计习题及解答》配套代码VC版

// c03b.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <iostream.h>
#include <iomanip.h>

long numOf5( long n );

int main(int argc, char* argv[])
{
	long n;
	cout << "请输入一个正整数：";
	cin >> n;
	if ( n < 0 )
		n = 1;
	cout << endl;

	long k = 0, k_old = 0;
	for ( int j = 1; j <= n; ++j )
	{
		k_old = k;
		int i = 5;
		for ( k = 0; i <= j; i +=5 )
			k += numOf5( i );
		
		if ( k_old != k )
			cout << endl;
		cout << setw(5) << j << "! 中末尾0的个数为 " << setw(5) << k << endl;
	}

	cout << endl;
	return 0;
}

long numOf5( long n )
{
	long i = 0;
	for ( ; n%5==0; ++i )
		n /= 5;

	return i;
}