CODEWITHSUNDEEP
c++sorting
cillian
cillian

Reputation: 3

when I use the c++ STL sort function in string sort,there is some problem

C++ code

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <fstream>
using namespace std;
int
main ()
{
  vector < string > elem (4);
  ifstream infile ("test.txt");
  if (!infile)
    {
      cerr << "Oops! unable to save session data !\n";
    }
  int i;
  for (i = 0; infile >> elem[i]; i++);
  for (i = 0; i < 4; i++)
    {
      cout << elem[i] << ' ';
    }
  cout << "\nThe result after sorting\n";
  sort (elem, elem + 4);
  for (i = 0; i < 4; i++)
    {
      cout << elem[i] << ' ';
    }
  cout << endl;
  return 0;
}

THis is my full code,when I run,there is some problem

main.cpp: In function ‘int main()’: 
main.cpp:24:20: error: no match
for ‘operator+’ (operand types are ‘std::vector >’ and ‘int’)    sort
(elem, elem + x);
       ~~~~~^~~

enter image description here

Upvotes: 0

Views: 141

Answers (1)

vonbrand
vonbrand

Reputation: 11801

Your usage of std::sort is C-ish. You have to supply iterators to begin/end, i.e., write something like

sort(elem.begin(), elem.end());

Besides, your program will crash if the test.txt file is more than 4 lines (trying to read into non-existent elem[4]).

Be careful though, check that the default comparison does what you want. Here it does.

Upvotes: 3

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