Remove whitespace from file

C++
1

I have pasted my .cpp code below, my goal is removing the whitespace from my .txt file. Is someone able to provide suggestions and help me figure this out?

#include <iostream>
#include <sstream>
using namespace std;
string solve(string s) {
   string answer = "", temp;
   stringstream ss;
   ss << s;
    while(!ss.eof()) {
      ss >> temp;
      answer+=temp;
     }
   }
   return answer;
}
int main() {
   char buffer[100];
   FILE *fp = fopen("input.txt", "r");
   while (fgets(buffer, sizeof(buffer), fp))
   {
     cout << solve(fp);
   }
   fclose(fp);
   return (0);
}
2

Doesn’t fgets put the string into that buffer variable? I would expect your function needs to take the buffered string and handle that. Also, not sure if you need to clear the buffer between reads.

3

Alternatively, can you use getline instead?

4

Sorry for replying to an old question.

Your approach is fine. But you need to either use const char *char_pointer or std::string in both reading and processing of text.

In main, you have used const char *char_pointer, while in string solve(string) there is a string parameter. They are not compatible.

Either change the string parameter in string solve(string) to FILE * (which is discouraged in C++) or read your file using ifstream object from fstream header.

Mosh has explained using fstream objects in Streams and Files module in part 2 of C++ course.

PS: Remove curly bracket from line 11 or 12