基础练习 十进制转十六进制

#include <cstdio>
#include <stack> 
//#include <ctime>
#include <string>
#include <iostream>
using namespace std;

void DecimalToHex(long long int num)
{
	stack<char> s;
	long long int rest;
	if(num == 0)
		cout <<"0";
	while(num != 0)
	{
		rest = num % 16;
		s.push((rest > 9 ? 'A' + rest - 10 : rest + '0'));
		num >>= 4; //num /= 16； 
	}
	while(s.empty() != true)
	{
		cout << s.top();
		s.pop();
	}
	cout << endl;
} 

int main()
{
	long long int num;
	//遇到用scanf需要考虑输入类型的问题，为了避免操作系统等带来的麻烦，采用cin输入 
	cin >> num;               
        DecimalToHex(num);
//	printf("%.2f\n", (double)clock()/CLOCKS_PER_SEC);
	return 0;
}