Question

C++ Programming Objects

Problem Assignment: Programming challenge #1 on page 714: "File Head Program" Write a program that asks the user for the name of a file. The program should display the first ten lines of the file on the screen (the “head" of the file). If the file has fewer than ten lines, the entire file should be displayed, with a message indicating the entire file has been displayed. Lab Help: Use the following two files to test your output. Make sure that you download these two files and store them in the same directory where the lab program solution is: poem1.txt poem2.txt

Answer 1

Need to edit only where the file read less than 20 lines it should has to change the 10 so that it will read 10 lines

while(!file.eof() && lines < 10)

this line will read the file if file has less than 10 lines other wise terminate the loop

cpp files:

#include <iostream>
#include<string>
#include<cstdlib>
#include <fstream>
using namespace std;

int main () {
   string name; //file name
   string inputline; //file line
   int lines=0; //number of lines
  
   //ask to enter file name
   cout<<"Enter the file name: ";
   getline(cin,name);
   ifstream file;
   file.open(name.c_str()); //will not create a new file it will only open it.
   //check for the if file exist
   if(!file){
       cout<<"Error opening "<<name<< endl;
       exit(EXIT_FAILURE);
   }
   //loop until end of file and file lines less than 10
   while(!file.eof() && lines < 10){
       getline(file, inputline, '\n');   //get line of the file
       lines++; //increment line  
       cout<<inputline<<endl; //ouput lines
   }
  
   if(lines<10) //check for the less than 10 lines
       cout<<"\n The entire file has been displayed.\n";
  
   file.close(); //close file
   return 0;  
}

testing files:

poem1.txt:

had no direction to go up: and this the shattery road
its surface graining, trickle in late thaw is nothing amiss?
this melt, the sign assure us, natural cycle
and woosh, the water a dream of forgotten white
past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainted leaves
had no direction to go up: and this the shattery road
its surface graining, trickle in late thaw is nothing amiss?
this melt, the sign assure us, natural cycle
and woosh, the water a dream of forgotten white
past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainted leaves
had no direction to go up: and this the shattery road
its surface graining, trickle in late thaw is nothing amiss?
this melt, the sign assure us, natural cycle
and woosh, the water a dream of forgotten white
past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainted leaves
had no direction to go up: and this the shattery road
its surface graining, trickle in late thaw is nothing amiss?
this melt, the sign assure us, natural cycle
and woosh, the water a dream of forgotten white
past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainted leaves
had no direction to go up: and this the shattery road
its surface graining, trickle in late thaw is nothing amiss?
this melt, the sign assure us, natural cycle
and woosh, the water a dream of forgotten white
past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainted leaves

poem2.txt:

had no direction to go up: and this the shattery road
its surface graining, trickle in late thaw is nothing amiss?
this melt, the sign assure us, natural cycle
and woosh, the water a dream of forgotten white
past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainted leaves

sample output:

Enter the file name: poem1.txt had no direction to go up: and this the shattery road its surface graining, trickle in late thaw is nothing amiss? this melt, the sign assure us, natural cycle and woosh, the water a dream of forgotten white past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainte d leaves had no direction to go up: and this the shattery road its surface graining, trickle in late thaw is nothing amiss? this melt, the sign assure us, natural cycle and woosh, the water a dream of forgotten white past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainte d leaves Process exited after 4.252 seconds with return value o

Enter the file name: poem2.txt had no direction to go up: and this the shattery road its surface graining, trickle in late thaw is nothing amiss? this melt, the sign assure us, natural cycle and woosh, the water a dream of forgotten white past aspens colored in sulfur, they trimbled, would poor sinners in redemption song hed their tainte d leaves The entire file has been displayed. Process exited after 4.47 seconds with return value o