HDU100练习

#include <algorithm>
#include <iostream>             C++函数的调用
#include <cstdlib>
using namespace std;
int main(void) {
  char s[4];

  while (cin >> s) {
    sort(s, s + 3);
    cout << s[0] << ' ' << s[1] << ' ' << s[2] << endl;
  }

  return EXIT_SUCCESS; //等同于 return 0
}


#include<iostream>
using namespace std;
int main()
{
	char a[3];
	while (cin >> a)//输入字符 ，可以一直输入 
	{
		if (a[0] > a[1]) swap(a[0], a[1]);//比较 
		if (a[0] > a[2]) swap(a[0], a[2]);
		if (a[1] > a[2]) swap(a[1], a[2]);
		cout << a[0] << " " << a[1] << " " << a[2] << endl;
	}
	return 0;
}



冒泡法
#include<iostream>
using namespace std;
int main()
{
    char str[3];
    while (cin >> str)
    {
        char l;
        for (int n = 0; n < 2; n++)//冒泡排序 
            for (int i = 0; i < 2; i++)
                if (str[i] > str[i + 1])
                {
                    l = str[i];
                    str[i] = str[i + 1];
                    str[i + 1] = l;
                }
        for (int i = 0; i < 2; i++)
        {
            cout << str[i];//输出0-2，每输出1个空1下 
            cout << " ";
        }
        cout << str[2] << endl;//到str[2]换行 
    }
}


#include <stdio.h>
int main()
{
	char a,b,c,t;
	while(scanf("%c%c%c%*c",&a,&b,&c)!=EOF) //用"%*c"(空字符，不存储字符的字符)滤掉回车
{
	if(a>b) t=a,a=b,b=t;//逗号表达式，简洁 
	if(a>c) t=a,a=c,c=t;
	if(b>c) t=b,b=c,c=t;
	printf("%c %c %c\n",a,b,c);
}
	return 0;
}

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
int main(void) {
  double x[2], y[2];

  while (scanf("%lf%lf%lf%lf", x, y, x+1, y+1) != EOF) {
    printf("%.2f\n", sqrt(pow(x[1] - x[0], 2) + pow(y[1] - y[0], 2)));
  }

  return 0;
}



#include<stdio.h>
#include<math.h>
int main()
{
	double x1,y1,x2,y2;
	double z;
	while(scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2)!=EOF)
	{
		z=sqrt(pow((x1-x2),2)+pow((y1-y2),2));
		printf("%.2f\n",z);
	}
	 
}

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#include<stdio.h>
#include<math.h>
#define P 3.1415927
int main()
{
	double r,n;
	while(scanf("%lf",&r)!=EOF)
	{
		n=4.0/3.0*P*pow(r,3);
		printf("%.3f\n",n);
	}
}