C :

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
#include<math.h>
char s[10001],t[1001],tmp[1],smx[10001];
int main(){	
 	gets(s);
 	int len = strlen(s),i,j,sum=0,n=0,mx=0;
    for(i=0;i<len;i++){
       if(i==0 && s[i]!=' ' || i>0 && s[i]!=' ' && s[i-1]==' '){
       		memset(t,0,sizeof(t));
       		for(j=i;j<len && s[j]!=' ';j++){
       			tmp[0] = s[j];
       			strcat(t,tmp);
       			sum++;
			}
			if(strlen(t)>mx){
                mx = strlen(t); 
                memset(smx,0,sizeof(smx));
                strcat(smx,t);
            }
            n++;
	   }
    }
    printf("%d\n%.1lf\n%s",n,sum*1.0/n,smx);
	return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;

string s,w,ma;
int i,c,len;
double v;
int main() {
	getline(cin,s);
	
	for(i = 0;i < s.size();i++){
		if(s[i] != ' '){
			w = w + s[i];
			
			if(i == s.size() - 1 || s[i+1] == ' '){
				c++;
				len = len + w.size();
				//cout<<w<<endl;
				if(w.size() > ma.size()){
					ma = w;
				}
				w = "";
			}
		}
	}
	
	cout<<c<<endl;
	cout<<fixed<<setprecision(1)<<len * 1.0 / c<<endl;
	cout<<ma;
	
	
}

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		String str1 = "" + str.charAt(0);
		for(int i = 0;i <str.length()-1;i++) {
			if(str.charAt(i) == ' ' && str.charAt(i+1) == ' ') {
				continue;
			}else {
				str1 += str.charAt(i+1);
			}
		}
		String str2 = str1.trim();
		String[] arr = str2.split(" ");
		System.out.println(arr.length);
		double count = 0;
		for(int i = 0;i < arr.length;i++) {
			count += arr[i].length();
		}
		System.out.println(String.format("%.1f", count / arr.length));
		int lenght = arr[0].length();
		int index = 0;
		for(int i = 1 ;i < arr.length;i++) {
			if(arr[i].length() > lenght) {
			lenght = arr[i].length();
				index = i;
			}
		}
		System.out.println(arr[index]);
	}

}