please help to with this program by mainly using arrays and pointers ,... i need this program to check 2 matrix files "if they contain any character and if they contain cout<<"invalid"; " and to open them from .txt file

Help with Code Tags
cplusplus Syntax (Toggle Plain Text)

1.
      #include<iostream>
   2.
      #include<fstream>
   3.
      #include<string>
   4.
      #include<cmath>
   5.
      using namespace std;
   6.
       
   7.
      int main()
   8.
      {
   9.
      char y, n;
  10.
      ifstream file1;
  11.
      ifstream file2;
  12.
      string filename1;
  13.
      string filename2;
  14.
      string c;
  15.
      int number;
  16.
      int choice;
  17.
       
  18.
      cout<<"xxxxxxx matrix calculator \n";
  19.
      cout<<"please choose from the following menu :\n";
  20.
       
  21.
      while(choice!=8&&choice==n)
  22.
      {
  23.
      cout<<"1. matrix addition\n";
  24.
      cout<<"2. matrix subtraction\n";
  25.
      cout<<"3. matrix multiplication\n";
  26.
      cout<<"4. matrix transpose\n";
  27.
      cout<<"5. checking matrix equality\n";
  28.
      cout<<"6. check matrix properties\n";
  29.
      cout<<"7. matrix power\n";
  30.
      cout<<"8. exit\n";
  31.
      cout<<"please enter your choice\n";
  32.
      cin>>choice;
  33.
       
  34.
      while(//condition when there is character)// for the first file and the second one :D
  35.
      {
  36.
      cout<<"invalid file!!\n";
  37.
      cout<<"do you want to continue (y) or return to menu(n)\n";
  38.
      /* "y" to continue to try to enter the file name again & "n" to go back to the menu*/
  39.
      cin>>choice1;
  40.
      if(choice1=='y')
  41.
      {
  42.
      cout<<"please enter the first filename\n";
  43.
      cin>>filename1;
  44.
      file1.open(filename1.c_str(),ios::in);
  45.
       
  46.
      if(!file1.fail())
  47.
      {
  48.
      cout<<"good\n";
  49.
      break;
  50.
      }
  51.
      }
  52.
      else if(choice1=='n')
  53.
      {
  54.
      cout<<"assdasdasdad\n";
  55.
      break;
  56.
      }
  57.
      }
  58.
       
  59.
       
  60.
       
  61.
      switch(choice)
  62.
      {
  63.
      case 1 :
  64.
       
  65.
      case 2 :
  66.
       
  67.
      case 3 :
  68.
       
  69.
      case 4 :
  70.
       
  71.
      case 5 :
  72.
       
  73.
      case 6 :
  74.
       
  75.
      case 7 :
  76.
       
  77.
      case 8 :
  78.
      cout<<"thank you for using my program\n";
  79.
      exit(1);
  80.
      }
  81.
       
  82.
      system ("pause");
  83.
      return 0;
  84.
      }
  85.
      }

You can use something like if

if (isalpha(a))//Here 'a' is just a variable in which a character is filled in
{
cout<<"Invalid";
}

Youshould include the header cctype for this function. It detects if the input is an alphabet and if it is it executes the statement.

It isn't necessary for you to manually put all those line numbers in your code -- the code tags will do that for you.

This tells you to use code tags - http://www.daniweb.com/forums/forum2.html
So does this - http://www.daniweb.com/forums/forum8.html
Wait for it, wait for it - http://www.daniweb.com/forums/announcement8-3.html
You're not going to believe this - http://www.daniweb.com/forums/thread78223.html
And not forgetting the watermark at the back of the edit window.

This article has been dead for over six months. Start a new discussion instead.