Задачка из учебника..

#include <iostream>
#include <iomanip.h>
 
using std::cout;
using std::cin;
using std::endl;
 
int main()
{
    float count, g=0, m=0, sum1=0,sum2=0, mg=0;
    
    do{
        cout << "Виедите расход бензина (-1 если ввод закнчен): ";
        cin >> g;
    
        if (g!=-1){
            sum1 = sum1 + g;
            
                cout << "Введите пройденный путь: ";
                cin >> m;
                
                sum2 = sum2 + m;
                
                mg = m / g;
                cout << "Для этой емкости получено миль /галлон: " << setprecision(6)
                << setiosflags(ios::fixed|ios::showpoint) 
                << mg <<endl;
        
        }
    
    }
    while (g!=1)  
count = sum1 / sum2;
    
cout << "Средний расход бензина: " << setprecision (6)
        << setiosflags (ios::fixed|ios::showpoint)
        << count << endl;
        
        return 0;
}

In file included from c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/backward/iomanip.h:31,
                 from main.cpp:2:
c:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
main.cpp: In function `int main()':
main.cpp:33: error: expected `;' before "count"
main.cpp:40:2: warning: no newline at end of file
make[2]: *** [build/Debug/MinGW_1-Windows/main.o] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
 
 
ПОСТРОИТЬ FAILED (значение выхода 2, общее время: 880мс)

main.cpp: In function `int main()':
main.cpp:22: error: `setprecision' was not declared in this scope
main.cpp:23: error: `ios' has not been declared
main.cpp:23: error: `fixed' was not declared in this scope
main.cpp:23: error: `ios' has not been declared
main.cpp:23: error: `showpoint' was not declared in this scope
main.cpp:23: error: `setiosflags' was not declared in this scope
main.cpp:36: error: `setprecision' was not declared in this scope
main.cpp:37: error: `ios' has not been declared
main.cpp:37: error: `fixed' was not declared in this scope
main.cpp:37: error: `ios' has not been declared
main.cpp:37: error: `showpoint' was not declared in this scope
main.cpp:37: error: `setiosflags' was not declared in this scope
main.cpp:41:2: warning: no newline at end of file
make[2]: *** [build/Debug/MinGW_1-Windows/main.o] Error 1
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2
 
 
ПОСТРОИТЬ FAILED (значение выхода 2, общее время: 1s)

#include <iostream>
#include <iomanip>
using namespace std;
 
int main()
{
    float g;
    float m=0, sum1=0,sum2=0, mg=0;
    
    do{
        cout << " ";
        cin >> g;
    
        if (g!=-1){
            sum1 = sum1 + g;
            
                cout << "??????? ?????????? ????: ";
                cin >> m;
                
                sum2 = sum2 + m;
                
                mg = m / g;
                cout << "??? ???? ??????? ???????? ???? /??????: " << setprecision(6)
                << setiosflags(ios::fixed|ios::showpoint) 
                << mg <<endl;
        
        }
    
    }
    while (g!=1);  
float vstsumma=0;
    vstsumma= sum1 / sum2;
    
cout << "??????? ?????? ???????: " << setprecision (6)
        << setiosflags (ios::fixed|ios::showpoint)
        << vstsumma << endl;
        
return 0;
}

// Упражнение 2.16 расход бензина.cpp : Defines the entry point for the console application.
//
 
#include "stdafx.h"
#include "iostream"
#include "iomanip"
using namespace std;
 
 
int _tmain(int argc, _TCHAR* argv[])
{   float rashod, rastojanie, kolichestvoVvodov = 0, sum = 0, srednee;
    cout << "Vvedite rashod benzina(-1, esli vvod okonchen): ";
    cin >> rashod;
    while (rashod != -1){
        cout << "Vvedite projdenoe rastojanie: ";
        cin >> rastojanie;
        cout << "Rashod dlja etogo baka " << setiosflags(ios::fixed | ios::showpoint) << setprecision(6) << rastojanie / rashod << " m/g" << endl;
        kolichestvoVvodov += 1;
        sum += (rastojanie / rashod);       
        cout << "Vvedite rashod benzina(-1, esli vvod okonchen): ";
        cin >> rashod;
 
        
        }
    if (kolichestvoVvodov ==0)
        cout << "vi ni4ego ne vveli"<< endl;
    else {      
    srednee = sum / kolichestvoVvodov;
    cout << "Sredniu rashod " << setiosflags(ios::fixed | ios::showpoint) << setprecision(6) << srednee << " m/g" << endl;
    }
    system("pause");
    return 0;
}