Question

C++ problem. hi heys, i am trying to remove beginning and the end whitespace in one file, and output the result to another file. But i am confused about how to remove whitespace. i need to make a function to do it. It should use string, anyone can help me ?

here is my code.

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <fstream>

using namespace std;
void IsFileName(string filename);

int main(int argc, char const *argv[]) {
string inputfileName = argv[1];
ifstream inStream;
inStream.open("first.txt");
IsFileName(inputfileName);

string outputfileName = argv[2];
ofstream outStream;
outStream.open("second.txt");
IsFileName(outputfileName);

string line;
while (getline(inStream, line))
{
cout << line << endl;
outStream << line <<endl;
}

inStream.close();
outStream.close();

/*add code*/
return 0;
}// main

void IsFileName(string filename){
ifstream inStream;
inStream.open(filename.c_str());
if (inStream.fail()){
cout << "Error opening the file"<<endl;
exit(0);
}
}

Answer 1

Question:

C++ problem. hi heys, i am trying to remove beginning and the end whitespace in one file, and output the result to another file. But i am confused about how to remove whitespace. i need to make a function to do it. It should use string, anyone can help me ?

here is my code.

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <fstream>

using namespace std;
void IsFileName(string filename);

int main(int argc, char const *argv[]) {
string inputfileName = argv[1];
ifstream inStream;
inStream.open("first.txt");
IsFileName(inputfileName);

string outputfileName = argv[2];
ofstream outStream;
outStream.open("second.txt");
IsFileName(outputfileName);

string line;
while (getline(inStream, line))
{
cout << line << endl;
outStream << line <<endl;
}

inStream.close();
outStream.close();

/*add code*/
return 0;
}// main

void IsFileName(string filename){
ifstream inStream;
inStream.open(filename.c_str());
if (inStream.fail()){
cout << "Error opening the file"<<endl;
exit(0);
}
}

Answer:

Removing white-spaces from a string can be done by below logic,

** Define a 'index' variable to keep track of non-space character,

** In the given Input String 'line' traverse in the String.

** Check the given string index holds 'non-spaces' then increment the index value.and store the same character into string.

** Doing above operation will prevent adding 'white-space' character into the string. Output String Holds only non-space characters only.

As per above logic below is the Code New Code added in BOLD

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <fstream>

using namespace std;
void IsFileName(string filename);

int main(int argc, char const *argv[]) {
string inputfileName = argv[1];
ifstream inStream;
inStream.open("first.txt");
IsFileName(inputfileName);

string outputfileName = argv[2];
ofstream outStream;
outStream.open("second.txt");
IsFileName(outputfileName);

string line;
while (getline(inStream, line))
{
cout << line << endl;
outStream << line <<endl;
}

inStream.close();
outStream.close();

/*add code*/

//start of the code

//remove spaces from the string 'line'

//define variable index to keep track of non-space character

int index = 0;

//do remove space logic as shown below

for(int i = 0; line[i]; i++){

//If character is not-a-space then

if (line[i] != ' ') {

line[index++] = line[i];

}

}

line[index] = '\0';

//end of remove spaces code
return 0;
}// main

void IsFileName(string filename){
ifstream inStream;
inStream.open(filename.c_str());
if (inStream.fail()){
cout << "Error opening the file"<<endl;
exit(0);
}
}

Compile and execute the above code gcc compiler compatible operating systems.

Sample Output For the Same Could be like this:

Input String: " PaulJames "

Output String: "PaulJames"