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#include <vector>
using namespace std;
 
struct predmet
{
	double c;
	double v;
	predmet()
	{
	c=1;
	}
};
 
vector<predmet> Predmets;
int num;
 
double reflesh(int num)
{
	double S=0;
	for (int i = 0; i < num; i++) 
	{
		S+=Predmets[i].c*Predmets[i].v;
	}
	return(S/num);
}
 
int main() {
	double coef=244 / 136;
	int semestr;
	cout<<"number of predmets";
	cin>>num;
	Predmets.resize(num);
	cout<<"semestr:prioretet(0-10)";
   	for (int i = 0; i < num; i++) 
	{
		cin>>semestr;
		if(semestr<10)
			if(semestr==1)
				Predmets[i].c+=coef-1;
		else if(semestr<100)
			if(semestr/10 == 1 || semestr % 10 == 1)
				Predmets[i].c+=coef;
		else if(semestr<1000)
			if(semestr/100 == 1 || semestr/10 == 1 || semestr % 10 == 1)
				Predmets[i].c+=coef+1;
		cin>>Predmets[i].v;
 
        }
	cout<<"you number ";
	printf( "%.3f\n", reflesh(num) );
	cout<<" correct number ";
	printf( "%.3f\n", 6.32352941176);
	system("pause");
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:30:2: error: 'cout' was not declared in this scope
  cout<<"number of predmets";
  ^
prog.cpp:31:2: error: 'cin' was not declared in this scope
  cin>>num;
  ^
prog.cpp:50:33: error: 'printf' was not declared in this scope
  printf( "%.3f\n", reflesh(num) );
                                 ^
prog.cpp:53:16: error: 'system' was not declared in this scope
  system("pause");
                ^

Standard output is empty