program 75 include fstream include iomanip include stdlib include math using

Program 75 include fstream include iomanip include

This preview shows page 42 - 51 out of 51 pages.

// program 7.5 #include <fstream> #include <iomanip> #include <stdlib> #include <math> using namespace std; int main (){
Image of page 42
Example (Cont..) const int MAXCHARS =10; const char fname[MAXCHARS] = "polar.dat"; const int LINES = 6; ofstream outfile; int i; float dist, angle; outfile.open(fname); if (outfile.fail())
Image of page 43
Example (Cont..) { cout << "\n Failed to open the data file.\n"; exit (1); } outfile << setiosflags (ios::fixed) << setiosflags (ios::showpoint) << setprecision (1);
Image of page 44
Example (Cont..) for (i =1; i <= LINES; i++) { cout <<"Enter a distance and angle: "; cin >> dist >> angle; outfile << setw(5) << dist << setw (14) << angle << endl; } outfile.close ( ); return 0; }
Image of page 45
Example Using the polar.dat file created in program 7.5, write a C++ program that reads this file and creates a second file named xycord.dat. The entries in the new file should contain the rectangular coordinates corresponding to the polar coordinates in the polar.dat file. Polar coordinates are converted to rectangular coordinates using the equations X = r cos Y = r sin Where r is the distance coordinate and is the radian equivalent of the angle coordinate in the polar.dat file.
Image of page 46
Example (Cont..) // program 7.6 #include <fstream> #include <iomanip> #include <stdlib> #include <math> using namespace std; void calcxy (ifstream &, ofstream &); int main (){ const char MAXCHARS = 15; const char infile[MAXCHARS] = "polar.dat";
Image of page 47
Example (Cont..) const char outfile[MAXCHARS] = "xycord.dat"; ifstream in; ofstream out; in.open (infile); if (in.fail ()) { cout << "\n The file can not be opened" << "\n Please check that the file currently exists." << endl; exit (1); }
Image of page 48
Example (Cont..) out.open (outfile); if (out.fail ()) { cout << "\n Failed to open the data file. \n"; exit (2); } calcxy (in, out); in.close (); out.close (); return 0; }
Image of page 49
Example (Cont..) void calcxy (ifstream & infile, ofstream & outfile) { const float CONVERT = 3.1416/180.0; const int LINES = 6; int i; float dist, angle; float x, y; outfile << setiosflags (ios::fixed) <<setiosflags(ios::showpoint) << setprecision (2);
Image of page 50
Example (Cont..) for (i = 1; i <= LINES; i++) { infile >> dist >> angle; cout << "dist =" <<dist<< " angle = " << angle << endl; x = dist* cos(angle*CONVERT); y = dist * sin(angle*CONVERT); outfile << setw (6) << x << setw(10) << y << endl; } }
Image of page 51

You've reached the end of your free preview.

Want to read all 51 pages?

  • Fall '18
  • Heidar Malki
  • Filename, Filename extension, Computer file, random access

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture