[Dev-C++] fread get stuck

[Kristian M. <kri...@ya...>]

Hi, all!

I've been using gcc in linux for a while, but now I'm trying do compile some example codes I've under Dev-C++, and I'm facing some problems.

Below follow two programs: one opens a file where it write 1000 random numbers and the other open a file to read numbers and print them into the screen. Thet work perfectly under gcc/linux, but at Dev-C++/windows the program that reads the file get stuck at a particular number. For the same file, it always stops reading at the same line, although for different files, it stops at different lines.

I suspect it's something defined as open behaviour in C/C++ specification, because the same programs work fine at gcc/linux, but I don't know what. Does anyone have an idea what I'm doing wrong?

Thanks!



#include <iostream>
#include <stdlib.h>

using namespace std;

int main (int argc, char *argv[])
{
  /* inicializa gerador de numeros aleatorios */  
  srand(time(NULL));
  
  /* abre arquivo para escrita, criando se nao existir */
  /* cursos posicionado no inicio do arquivo */  
  FILE* file = fopen(argv[1], "w+");  
  if (file == NULL)
  {
    cout << "Erro ao criar arquivo." << endl;     
  }
  else
  {
    for (int i = 0; i < 1000; i++)
    {  
      
      /* pausa execucao */ 
      if (i % 100 == 0 && i > 0) cin.get();  
      
      /* escreve um numero aleatorio no arquivo aberto */
      int aleatorio = rand() % 1000;
      cout << i + 1 << "\tEscrevendo '" << aleatorio 
           << "' no arquivo '" << argv[1] << "'." << endl;
      int elementosEscritos = fwrite(&aleatorio, 1, sizeof(int), file);
      if (elementosEscritos < 0)
      {
        cout << "Erro ao escrever em arquivo.";                
      }
    }  
  }
  
  /* fecha arquivo */
  fclose(file);

  /* pausa execucao */ 
  cin.get();
  
  return 0;
}






#include <iostream.h>
#include <stdlib.h>

using namespace std;

int main (int argc, char *argv[])
{
 
  /* abre arquivo para leitura */
  /* cursos posicionado no inicio do arquivo */  
  FILE* file = fopen(argv[1], "r+");  
  if (file == NULL)
  {
    cout << "Erro ao abrir arquivo '" << argv[1] << "'." << endl;     
  }
  else
  {
    int i = 0;
    int elementosLidos;
    int aleatorio;

    /* le um numero do arquivo aberto */
    while (elementosLidos = fread(&aleatorio, sizeof(int), 1, file) > 0)  
    {
      i++;
      cout << i << "\tLeu '" << aleatorio 
           << "' (" << elementosLidos << " elementos) do arquivo '" 
           << argv[1] << "'." << endl;        
    }  
  }
  
  /* fecha arquivo */
  fclose(file);

  /* pausa execucao */ 
  cin.get();
  
  return 0;
}





       
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