HELP [error] expected unqualified-id before '{' token

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#include <iostream>
using namespace std;
int minimum (double grades [], int N)
{
	double ans = 101;
	for ( int i = 0; i< N; i++)
		if (grades [i] < ans)
		ans = grades [i];
		return ans;
}

int maximum (double grades [], int N)
{
	double ans = -1;
	for (int i=0 ; i<N ; i++)
	if (grades [i] > ans)
	ans = grades [i];
	return ans;
}

{
double min_value;
int min_index;
double temp;
for (int i =0; i<npts -1 ; i++)
{
min_value = x[i];
min_index = i;
for (int j=i+1; j<npts; j++)
{
	if (x[j] < min_value)
	{
		min_value = x[j];
		min_index = j;
	}
}
temp = x[min_index];
x[min_index]= x[i];
x[i] = temp;
}
	return;
}


int main ()
{
	int N;
	double grades [100];
	cout << "Enter the number of students" << endl;
	cin >> N;
	int i = 0;
	double value;
	while (i<N)
	{
		com >> value;
		if (value >= 0 && value <=100)
		{
			grades [i] = value;
			i++;
		}
		else
		{
			cout << "Invalid grade. ReEnter" <<endl;
		}
	}
	cout <<"Maximum grade is = "<< maximum (grades,N) <<endl;
	cout << "Minimum grade is= " << minimum (grades,N) <<endl;
	cout << "Avergage grade is= "<< average (grades,N) <<endl;
	cout << "Numbers of the students above average are = " << nAboveAvg (grades,N) <<endl;
	sort (grades,N);
	cout << "Grades after sorting"<< endl;
	for (int i=0; i<n; i++)
	cout << grades[i] << " ";
	cout<< endl;
	system ("pause");
}

Что я уже пробовал:

Когда я компилирую это, он показывает мне

[error] expected unqualified-id before '{' token

в строке 26, где я выделил вот так >> <. Пожалуйста, помогите мне

int maximum (double grades [], int N)
{
	double ans = -1;
	for (int i=0 ; i<N ; i++)
	if (grades [i] > ans)
	ans = grades [i];
	return ans;
}

>> { <<
double min_value;
int min_index;
double temp;
for (int i =0; i<npts -1 ; i++)

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