Question

Write a program that reads a file, removes any blank lines at the beginning or end of the file, and writes the remaining lines back to the same file.

c++

Answer 1

CODE:

#include<iostream>
#include<fstream>

using namespace std;

int main(){
ifstream fin;
string line;
//declaring an array to store the lines from the input file
string *linesArray = new string[1000];
int lines = 0;

fin.open("input.txt");
while(fin){
getline(fin, line);
//a blank line will have a length zero, so the line with length zero will
//not be added in th array
if(line.length() != 0){
linesArray[lines] = line;
lines += 1;
}
}
//closing the input file
fin.close();
ofstream fout;
fout.open("input.txt");

//writing the lines other than the blank lines in the file
for(int i =0;i<lines;i++){
//the last line should not add another line in the end
if(i == lines-1)
{
fout<<linesArray[i];
break;
}
//printing the lines
fout<<linesArray[i]<<endl;
}
//closing the file
fout.close();
return 0;
}

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CODE IMAGES AND OUTPUT:

#include<iostream> #include<stream> 2 3 4 5 using namespace std; 6 7 8 int main() { ifstream fin; string line; //declaring an array to store the lines from the input file string *linesArray = new string(1000); int lines = 0; 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 fin.open("input.txt"); while (fin) { getline (fin, line); //a blank line will have a length zero, so the line with length zero will //not be added in th array if(line length() != 0) { linesArray[lines] = line; lines += 1; } //closing the input file fin.close(); ofstream fout; fout.open("input.txt"); 25 27 28 29 30 31 32 33 //writing the lines other than the blank lines in the file for (int i =0;i<lines; i++) { // the last line should not add another line in the end if(i = lines-1) D fout<<linesArray[i]; break; 34 } 35 36 37 //printing the lines fout<<linesArray[i]<<endl; } 38 39 40 //closing the file fout.close(); return 0; 41 42

THe input.txt file before executing the program:

input.txt - Notepad х File Edit Format View Help This is a line which will be written in the file without blank lines. This line also.

input.txt file after executing the program:

х input.txt - Notepad File Edit Format View Help This is a line which will be written in the file without blank lines. This line also.

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Feel free to ask any questions in the comments section

Thank You!

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