How to read formatted data in C++?

Question

I have a formatted data like the following:

Words          5
AnotherWord    4
SomeWord       6

It's in a text file and I'm using ifstream to read it, but how do I separate the number and the word? The word will only consist of alphabets and there will be certain spaces or tabs between the word and the number, not sure of how many.

Answer 1

It's actually very easy, you can find the reference here
If you are using tabs as delimiters, you can use getline instead and set the delim argument to '\t'. A longer example would be:

#include <vector>
#include <fstream>
#include <string>

struct Line {
    string text;
    int number;
};

int main(){
    std::ifstream is("myfile.txt");
    std::vector<Line> lines;
    while (is){
        Line line;
        std::getline(is, line.text, '\t');
        is >> line.number;
        if (is){
            lines.push_back(line);
        }
    }
    for (std::size_type i = 0 ; i < lines.size() ; ++i){
        std::cout << "Line " << i << " text:  \"" << lines[i].text 
                  << "\", number: " << lines[i].number << std::endl;
    }
}

Answer 2

I don't know if there is a function for this.

I assume you are able to grab each word since they are separated by spaces ASCII(32); perform an atoi conversion on each word.

It's been a while since I used atoi, and it is not clear how the function differentiates between '0' and "zero", but it would work for the example you have given.

kdda

Answer 3

Assuming there will not be any whitespace within the "word" (then it will not be actually 1 word), here is a sample of how to read upto end of the file:

std::ifstream file("file.txt");
std::string str;
int i;

while(file >> str >> i)
    std::cout << str << ' ' << i << std::endl;

Answer 4

The >> operator is overridden for std::string and uses whitespace as a separator

so

ifstream f("file.txt");

string str;
int i;
while ( !f.eof() )
{
  f >> str;
  f >> i;
  // do work
}

Answer 5

sscanf is good for that:

#include <cstdio>
#include <cstdlib>

int main ()
{
  char sentence []="Words          5";
  char str [100];
  int i;

  sscanf (sentence,"%s %*s %d",str,&i);
  printf ("%s -> %d\n",str,i);

  return EXIT_SUCCESS;
}