C++ Matriste en büyük değeri bulmada sorun.

 
   
  #include <cstdlib> 
  #include <iostream> 
  #include <fstream> 
  #include <iomanip> 
  #include <cmath> 
   
   
  using namespace std; 
   
  int main(int argc, char *argv[]) 
  { 
        cout << "MAX ABSOLUTE VALUE FINDER\n\n"; 
              cout << "======================================================\n"; 
        cout << "\n"; 
        cout << "BU PROGRAM BOYUTLARI GIRILEN BIR MATRISIN\n"; 
        cout << "HER BIR SUTUNUNDAKI MAX MUTLAK DEGERI VERIR\n\n"; 
        cout << "\n"; 
        cout << "======================================================\n\n\n"; 
   
         
        float u[4000][25]; 
        float absu[4000][25]; 
         
        int n; 
        int m; 
        float max=0; 
         
        cout << "Satir sayisini giriniz\n" << endl; 
        cout << "El Centro icin = 4000" << endl; 
        cout << "Northridge icin = 2000\n" << endl; 
        cin >> n; 
         
        n=n+1; 
         
        cout << "\n"; 
        cout << "\n"; 
         
        cout << "Sutun sayisini giriniz\n" << endl; 
        cin >> m; 
        cout << "\n"; 
        cout << "\n"; 
         
        ifstream ifile; 
        ifile.open ("data.txt"); 
         
        absu[1][2]=0; 
   
   
       
      for (int i=2; i<=n+1; i++) 
      { 
          for (int j=2; j<=m+1; j++) 
          { 
           
          ifile >> u[i][j]; 
          cout << u[i][j] << "\t"; 
          absu[i][j]=abs(u[i][j]);  
           
          } 
           
           
           
          cout << endl; 
   
      } 
       
          cout << "\n"; 
          cout << "max degerler:\n"; 
       
       
       
          for (int j=2; j<=m+1; j++) 
      { 
          for (int i=2; i<=n+1; i++) 
          { 
           
          if (absu[i-1][j] < absu[i][j]) 
          { 
                                        max=absu[i][j]; 
          } 
           
                  
          } 
           
          cout << max << endl;   
              
      } 
       
       
       
      ifile.close (); 
   
           
       
      system("PAUSE"); 
      return EXIT_SUCCESS; 
  }