很多初二的朋友们最近是不是都学到统计那一个单元了（反正我们学到那儿了）

所以我来分享一个好东西

#include<windows.h>
#include<time.h>
#include<stdlib.h>
#include<conio.h>
#include<math.h>
#include<iostream>
#include<algorithm>
#define ll long long
#define rll register long long
using namespace std;
char s[10000005];
ll arr[10000005],cnt;
inline void gotoxy(rll x,rll y){
	COORD pos;
	pos.X=2*x;
	pos.Y=y;
	SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),pos);
}
inline void color(rll a){
	SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),a);
}
inline void zhushi(){
	color(3);
	gotoxy(35,8);
	cout<<"注：";
	gotoxy(35,10);
	cout<<"由于C++精度问题，请勿输入小数。";
	gotoxy(35,12);
	cout<<"如果您实在需要计算小数，出门左转打开计算器。";
	gotoxy(35,14);
	cout<<"本程序所有结果均按保留两位小数处理。";
	gotoxy(35,16);
	cout<<"当计算完成后：";
	gotoxy(37,18);
	cout<<"按下'\\'键清屏重新输入。";
	gotoxy(37,20);
	cout<<"双击'`'键退出程序。"; 
	gotoxy(37,22);
	cout<<"（这两个符号均为英文符号）";
	gotoxy(0,0);
}
inline void shuru(){
	printf("请在一行内输入您的数据，用空格分开：\n");
	rll i=0,tmp,len;
	bool flag;
	gets(s);len=strlen(s);
	while(i<len){
		if(s[i]==' ')++i;
		flag=0;
		if(s[i]=='-')flag=1,++i;
		if('0'<=s[i]&&s[i]<='9'){
			tmp=0;
			while(s[i]!=' '&&i<len){
				tmp=tmp*10+s[i++]-'0';
			}
			arr[++cnt]=flag?-tmp:tmp;
		}
	}
} 
struct Node{
	ll num,id;
}kl[10005];
inline bool cmp(Node a,Node b){
	return a.id>b.id;
}
inline void tongji(){
	bool flag;
	rll i,ans,crt=0;
	double num=0,lop;
	sort(arr+1,arr+1+cnt);
	ans=arr[1];
	kl[++crt].num=arr[1];kl[crt].id=1;
	for(i=2;i<=cnt;i++){
		ans+=arr[i];
		if(arr[i]==kl[crt].num)kl[crt].id++;
		else {
			kl[++crt].num=arr[i];
			kl[crt].id=1;
		}
	}
	sort(kl+1,kl+1+crt,cmp);
	lop=ans*1.0/cnt;
	printf("平均数：%.2f\n",lop);
	printf("中位数：%.2f\n",cnt%2==1?arr[cnt/2+1]*1.0:(arr[cnt/2]+arr[cnt/2+1])*1.0/2);
	printf("众数：");
	flag=0;
	for(i=2;i<=crt;i++){
		if(kl[i].id!=kl[1].id)flag=1;
	}
	if(flag)for(i=1;i<=crt;i++){
		if(kl[i].id==kl[1].id)printf("%.2f ",kl[i].num*1.0);
	}else printf("无"); 
	printf("\n");
	printf("极差：%.2f\n",arr[cnt]*1.0-arr[1]);
	printf("方差：");
	for(i=1;i<=cnt;i++)num+=(arr[i]*1.0-lop)*(arr[i]*1.0-lop);
	lop=num/cnt;
	printf("%.2f\n",lop);
	printf("标准差：%.2f",sqrt(lop));
}
int main(){
	char ch;
	while(true){
		zhushi(); 
		shuru();
		tongji();
		while(true){
			ch=getch();
			if(ch=='\\'){
				system("cls");
				break;
			}
			else if(ch=='`'){
				return 0;
			}
		}
	}	
}

本人花了一上午写出来的qwq