(1) Why do several functions in iostream and fstream have identical names? When is it advantageous...
(1) Why do several functions in iostream and fstream have identical names? When is it advantageous to reuse function names?
(2) Describe the five-step process of file I/O. Explain how to use ifstream andofstream to open and close input and output files. Illustrate the process with the skeleton program provided in this section.
Homework Answers
Solution for the problem is provided below, please comment if any doubts:
(1).
Identical function name in iostream and fstream, since:
- The objective of both the classes iostream and fstream are same, handles data i/o operations, iostream concentrated on direct input/output but fstream concentrated in file input/out. That is the operations to be performed are same only the way it is to be done is different. Same operations in different classed could be name same in C++ even though it will not suffer the name conflict since CPP supports function overloading.
It advantages to reuse, when:
- It can be make advantageous when we have to perform the same operation on different variations of a class. It can be used to replace a function with another one that can do better work than other. The one name can’t tell anything about its functioning; it will be based on the class, the passed parameters, etc. So the same name can be used to increase the scope of functions.
(2)
Five-step process of file I/O:
- Include the proper header files in the beginning of the
program, that is “#include <fstream>” along with other header
files.
- #include <fstream>
- Declare and define the local file stream variables to be used
in the program, both input and output stream object needs to be
declared if there is both input and output operations are there.
- ifstream inputFileObject;
- ofstream outputFileObject;
- Map the variables with the files, both input and out using
ifstream and ofstream variables.
- inputFileObject.open(inputFilenName)
- outputFileObject.open(outputFilenName)
- Perform the operation on file, both write and read based on the
program requirements.
- data>> inputFilenName;
- outputFileObject<<data;
- Close the file objects to make the file operations saved
properly.
- inputFileObject.close();
- outputFileObject.close();
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/*Lab 8 : Practicing functions and arrays
Purpose:
*/
#include<iostream>
#include<fstream>
using namespace std;
int read_function(int array[], int, int);
int main()
{
int array[300], numba;
read_function(array[300]);
cout << "Enter a whole number between 2-20: " <<
endl;
cin >> numba;
read_function(numba);
return 0;
}
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int sum=0;
ifstream array_file;
array_file.open("Lab8.dat");
for(int i=0; i < 300; i++)
{
array_file >> arr[i];
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