#include <cstdlib>
#include <sstream>
using namespace std;

int main(int argc, char *argv[]) {
   istringstream buffer;
   int i;
   double value;
   int count = 0;
   double sum = 0;

   for (i = 1; i < argc; i++) {
      buffer.clear();
      buffer.str(argv[i]);
      if (buffer >> value) {  // exclude non-numbers
	sum += value;
        count++;
      }
   }
   printf("average = %.2f\n", sum / count);
}

• Reading The Matrix

  void readMatrix(vector<IVec > &matrix, string filename) {
    ifstream inFile;
    int numRows, numCols;
    int row, col;
  
    inFile.open(filename);
    inFile >> numRows >> numCols;
    matrix.resize(numRows);
    for (row = 0; row < numRows; row++) {
      matrix[row].resize(numCols);
      for (col = 0; col < numCols; col++) {
        inFile >> matrix[row][col];
      }
    }
    inFile.close();
    return;
  }
  	    

• Computing The Dot Product

  int dotProduct(vector<IVec > &matrix1, vector<IVec> &matrix2,
                    int row, int col) {
    int i;
    int length = matrix2.size();
    int sum = 0;
  
    for (i = 0; i < length; i++) {
      sum += matrix1[row][i] * matrix2[i][col];
    }
    return sum;
  }