Thread: Incrementing Vectors of type int

Hello all,
So I am teaching myself a little bit off C++, and I am trying to do an exercise in which it takes in a user's inputs of strings, and for every distinct string, state how many times it has occurred.

Example:
User Input: A B C A BOB
OUTPUT: A 2
B 1
C 1
BOB 1

So from what I've coded I have been able to put into a vector all the words that have occurred with no duplicates. I think my way of counting the words work, but the problem is how to increment my vector of int. I have looked at the functions that vectors have, and it doesn't seem like vectors have something for me to replace the element contained in it? With arrays, usually i would just do A[i] = A[i]++. It does not seem to work though with C++ when dealing with vectors...

Here is my code.

Code:

#include <algorithm>
#include <iomanip>
#include <ios>
#include <iostream>
#include <string>
#include <vector>
#include <conio.h>

using std::cin;
using std::sort;
using std::cout;
using std::streamsize;
using std::endl;
using std::string;
using std::setprecision; 
using std::vector;

int main(){

    // ask for set of words
    cout << "Enter all words, "
          "followed by end-of-file: ";
    vector<string> word_set;
    string x;

    // invariant: word_set contains all the words entered so far
    while (cin >> x)
          word_set.push_back(x);

   // check that the user entered some words
   typedef vector<string>::size_type vec_sz;
   vec_sz size = word_set.size();
   if (size == 0) {
      cout << endl << "You must enter some words. "
                      "Please try again." << endl;
      cout << "Press any key to continue... ";
      _getch();
      return 1;
      }

      vector<string> words;
      vector<int> occurs;
      
      //adds new words to the the words vector
      for(int i = 0; i != word_set.size(); i++){
              bool listed = false;
              for(int i2 = 0; i2 != words.size(); i2++){
                      if(words[i2] == word_set[i]){
                                   listed = true;
                                   }
                      }
              if(listed == false){
                       words.push_back(word_set[i]);
                       }
              }
              
      //initializes occurs vectors with the same size as words
      //each element is set to 0
      for(int i = 0; i != words.size(); i++){
              occurs.push_back(0);
              }
      
      //records occurences of words
      for(int i = 0; i != words.size(); i++){
              for(int i2 = 0; i2 != word_set.size(); i2++){
                      if(word_set[i2] == words[i]){
                                      //PROBLEM HERE.....
                                      occurs[i] = occurs[i]++;
                                      }
                      }
              }
              
      //writes out the words
      cout << "Your words for the dataset are: " << endl;
           for(int i = 0; i != words.size(); i++){
                   cout << words[i] << " "
                        << occurs[i] << endl;
                   }
      //for the purpose of not quitting out the cmd
      //due to my compiler
      cout << "Press any key to continue... ";
   _getch();
   return 0;
}

Thanks all!

Well so far...I have only been taught Vectors from the book...is there a way of solving this with vectors?

oh wow. thanks, that was a simple fix. I'll definitely give the map method a shot though. I'll come back to here if I have any problems. Thanks!