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  1. #include <iostream>
  2. #include <fstream>
  3. #include <string>
  4. #include <Windows.h>
  5. #include <sstream>
  6. #define N 1024
  7. #define Nx 1024
  8.  
  9. using namespace std;
  10.  
  11.  
  12. void writeFile( float *data, string fileName)
  13. {
  14.     ofstream out(fileName.c_str());
  15. 	for (int i = 0; i < N; i++)
  16.         {
  17.         for (int j = 0; j < Nx; j++)
  18.         {
  19.              out << data[j +i*Nx] << "\t";
  20.         }
  21.          out << '\n';
  22.     }
  23.     out.close();
  24. 	return;
  25. }
  26.  
  27.  
  28. void writeFile2( float *data, string fileName)
  29. {
  30. 	ofstream out(fileName.c_str());
  31. 	stringstream ss("");
  32. 	string os("");
  33. 	for (int i = 0; i < N; i++)
  34.         {
  35.         for (int j = 0; j < Nx; j++)
  36.         {
  37. 			 ss.str(string());
  38. 			 ss << *(data+i*Nx+j);
  39. 			 ss >> os ;
  40. 			 out.rdbuf()->sputn(os.c_str(),strlen(os.c_str()));
  41. 	         out.rdbuf()->sputn("\t",sizeof(char));
  42.         }
  43.         out.rdbuf()->sputn("\n",sizeof(char));
  44. 		out.flush();
  45.     }
  46. 	out.flush();
  47.  
  48.     out.close();
  49. 	return;
  50. }
  51.  
  52.  
  53. int main()
  54. {
  55.  
  56.  
  57. 	float *data =NULL ;
  58. 	data = new float[N*Nx]();
  59.  
  60. 	fill(data, data+N*Nx, 9.9f);
  61. 	DWORD s = GetTickCount();
  62. 	//writeFile( data,"ouput.txt");
  63. 	DWORD d = GetTickCount();
  64. 	cout<<(d - s) / 1000.f<<endl;
  65.  
  66. 	s = GetTickCount();
  67. 	writeFile2( data,"ouput2.txt");
  68. 	d = GetTickCount();
  69. 	cout<<(d - s) / 1000.f<<endl;
  70.  
  71. 	delete data;
  72. 	return 0;
  73. }//end of main
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:4:21: fatal error: Windows.h: No such file or directory
 #include <Windows.h>
                     ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/X3vCc2
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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