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Absolute C++ (4th Edition) part 53. KEY BENEFIT: C++ programming concepts and techniques are presented in a straightforward style using understandable language and code. KEY TOPICS: C++ Basics; Flow of Control; Function Basics; Parameters and Overloading; Arrays; Structures and Classes; Constructors; Operator Overloading, Friends, and References; Strings; Pointers and Dynamic Arrays; Separate Compilation and Namespaces; Streams and File I/O; Recursion; Inheritance; Polymorphism and Virtual Functions; Templates; Linked Data Structures; Exception Handling; Standard Template Library; Patterns and UML. MARKET: Useful for both beginning and intermediate C++ programmers. . | Tools for Stream I O 527 Display 12.7 Formatting Output part 2 of 2 44 cout End of program. n 45 return 0 46 47 48 49 50 51 52 53 54 55 56 57 58 Uses iostream fstream and iomanip void makeNeat ifstream messyFile ofstream neatFile int numberAfterDecimalpoint int fieldwidth neatFile.setf ios fixed neatFile.setf ios showpoint setf and precision neatFile.setf ios showpos ------- behave thesamefora file neatFile.precision numberAfterDecimalpoint output stream as they do for cout. cout.setf ios fixed cout.setf ios showpoint cout.setf ios showpos cout.precision numberAfterDecimalpoint 59 double next tottedif Mere ina 60 while messyFile next --- next number to read 61 62 cout setw fieldWidth next endl 63 neatFile setw fieldWidth next endl 64 Works the same for file output 65 streams as it does for cout rawdata.txt Not changed by program 10.37 -9.89897 2.313 -8.950 15.0 7.33333 92.8765 -1.237568432e2 neat.txt After program is run Screen Output 10.37000 10.37000 -9.89897 -9.89897 2.31300 2.31300 -8.95000 -8.95000 15.00000 15.00000 7.33333 7.33333 92.87650 92.87650 -123.75684 -123.75684 End of program. 528 Streams and File I O Example Editing a Text File The program discussed here is a very simple example of text editing applied to files. This program can be used to automatically generate C advertising material from existing C advertising material in a rather simplistic way . The program takes its input from a file that contains advertising copy that says good things about C and writes similar advertising copy about C in another file. The file that contains the C advertising copy is called cad.txt and the new file that receives the C advertising copy is called cppad.txt. The program is shown in Display 12.8. The program simply reads every character in the file cad.txt and copies the characters to the file cppad.txt. Every character is copied unchanged except that when the uppercase letter C is read from the input file the program writes the string C to the output file. This .
