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Код: Выделить всё

#include <iostream>
#include <numeric>
 
int main()
{
  const int n = 3;
  const int m = 3;
 
  int matrix[n][m] = {
    {1, 2, 3},
    {4, 5, 6},
    {7, 8, 9}
  };
 
  double average[n];
 
  for (int i = 0; i < n; ++i)
    average[i] = static_cast<double>(std::accumulate(matrix[i], matrix[i] + m, 0)) / m;
 
  for (int i = 0; i < n; ++i)
    std::cout << "Average " << i + 1 << ": " << average[i] << std::endl;
 
  return 0;
}

Код: Выделить всё

#include <iostream>
#include <numeric>
using std::cin;
int main(){
	int n,m,**matrix,i,j;
	double *average;
	cin>>n>>m;
	matrix=new int*[n];
	for(i=0;i<n;i++){
		matrix[i]=new int[m];
		for(j=0;j<m;j++)
			matrix[i][j]=i*n+j;
	}
	average=new double[n];
	for (int i = 0; i < n; ++i)
		average[i] = static_cast<double>(
			std::accumulate(matrix[i], matrix[i] + m, 0)
		)/m;

	for (int i = 0; i < n; ++i)
		std::cout << "Average " << i + 1 << ": " << average[i] << std::endl;
	delete []matrix;
	delete []average;
	cin.get(),cin.get();
	return 0;
}  

Код: Выделить всё

for(i=0;i<n;i++)
{
   delete [] matrix[i];
}