Can someone explain the process of this Display a text file program and show the supposed output of the program?
I tried it with my text file and all it does is printing out the same line of words for 24 times. Can you also explain what the [COL_WIDTH + 1 ] and the c = input_line [0] ; is doing?
Please show me what this program is doing. Thanks.
Here below is the actual program.
#include
#include
using namespace std;
#define COL_WIDTH 80
int main() {
int c; // input character
char filename[FILENAME_MAX];
char input_line[COL_WIDTH + 1];
cout << "Enter a file name and press ENTER: ";
cin.getline(filename, FILENAME_MAX);
ifstream file_in(filename);
if (! file_in) {
cout << filename << " could not be opened.";
cout << endl;
return -1;
}
while (true) {
for(int i = 1; i <= 24 && !file_in.eof(); ++i) {
file_in.getline(input_line, COL_WIDTH);
cout << input_line << endl;
}
if (file_in.eof()) {
break;
}
cout << "More? (Press 'Q' and ENTER to quit)";
cin.getline(input_line, COL_WIDTH);
c = input_line[0];
if (c == 'Q' || c == 'q') {
break;
}
}
return 0;
}
#include<iostream>
#include<fstream>
using namespace std;
#define COL_WIDTH 80
int main() {
int c; // input character
//used to store the file
name
//FILENAME_MAX is a predefined constant
//It specify the maximum length for a file name
char filename[FILENAME_MAX];
//used to store the line read
from file
//COL_WIDTH is the number of characters to be read from each
line
//In COL_WIDTH + 1, 1 is for storing string terminator
'\0'
char input_line[COL_WIDTH + 1];
//prompt the user to enter a
file name to be read
cout << "Enter a file name and press ENTER: ";
//read the file name and
stores in character array 'filename'
cin.getline(filename, FILENAME_MAX);
//make the file to be
read
ifstream file_in(filename);
//if file cannot be
opened
if (! file_in) {
cout << filename << " could not be opened.";
cout << endl;
return -1;
}
//indefinite while
loop
while (true) {
//reads first 24 lines
//file_in.eof() checks whether end of file is reached or
not
for(int i = 1; i <= 24 && !file_in.eof(); ++i) {
//reads 79 characters in each line and 80 for
'\0'
file_in.getline(input_line, COL_WIDTH);
//display the readed line
cout << input_line << endl;
//if it not reached the end
of file
//when the user press enter instead of 'q' or 'Q'
//then above for loop will read from 25th line to next 24
lines
//until reaching end of file
}
//checks whether end of file
is reached
//if it is the end , terminate the program
if (file_in.eof()) {
//break the while loop and exit program
break;
}
//ask user to continue or quit
cout << "More? (Press 'Q' and ENTER to quit)";
//read the input from user
//and stored to character array 'input_line'
cin.getline(input_line, COL_WIDTH);
// 'c' contains first
character in the character array 'input_line'
// 'q' or 'Q'
c = input_line[0];
//if c = 'q' or 'Q'
if (c == 'Q' || c == 'q') {
//terminate while loop and exit program
break;
}
}
return 0;
}
Below file has more than 80 characters in a line, the program read only 79 characters
Output from above text file
If a file cannot be opened
Can someone explain the process of this Display a text file program and show the supposed...
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