Dictionaries In C++

Question

I have just started to learn C++ and am fluent at coding in Python. I wanted to make one of my old python programs again in C++ and it's a word jumble one. In the Python program, you can choose the mode (easy, medium or hard). That aside each mode has it's own dictionary of words which the program chooses randomly. Paired to each word is a hint, hence using the dictionary.

Could someone explain how I would do this in C++?

Thank You

PS. I've got here so far, but I get errors

//Word Jumble - Ben
#include <iostream>
#include <cstdlib>
#include <map>
#include <string>
using namespace std;

int computer(){
    cout << "\nYOU ARE PLAYING AGAINST THE COMPUTER";
    cout << "COMPUTER IS JUBMBLING WORD...";
    system("PAUSE");
    system("CLS");
    map easy
    easy = {{"Ship","A large boat"}, {"Ladder","A Piece of Apparatus that helps you climb things"},{"Water","What the human body is mainly composed of"}};
int main(){
    cout << "\n\n               WELCOME TO WORD JUMBELE";
    cout << "\n                      BY BEN";
    computer()}

Errors:

C:\Users\Ben\SkyDrive\Documents\C++\Word Jumble\Word Jumble.cpp:12:9: error: missing template arguments before 'easy'

C:\Users\Ben\SkyDrive\Documents\C++\Word Jumble\Word Jumble.cpp:12:9: error: expected ';' before 'easy'

C:\Users\Ben\SkyDrive\Documents\C++\Word Jumble\Word Jumble.cpp:17:15: error: expected '}' at end of input

Answer 1

for this

map easy

At first you need to specified the value of map, e.g. map< string,string> easy.

Then you can use

easy["abc"] = "efg";   //like this

I guess you need

string a[100][2] = {{"Ship","A large boat"}, {"Ladder","A Piece of Apparatus that helps you climb things"},{"Water","What the human body is mainly composed of"}};

map<string,string> easy;
for(int i=0; i<3; i++)
    easy[a[i][0] ] = a[i][1];

Then you can use easy["Ship"] like this.

Answer 2

As the first error suggests, map easy is missing template arguments. In C++ you need to specify what types the map holds. I think what you want is map<string, string> easy.

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I also see that you are missing a semicolon after map easy and computer(). All variable definitions and function calls in C++ must end in a semicolon.

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Besides this, you are also missing a closing brace on computer().

Incidentally, computer() returns int, and because you don't have a return statement in computer() that will also cause an error. You could add one, but because you are not using the return value for anything, you may want to simply replace int with void, which will remove the need for a return statement.

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I actually had to copy your code and compile it myself to find all the errors. That would not have been necessary if you had not attempted to format your code as if it were Python. In C++, a better way to format this code is as follows:

int computer(){
    cout << "\nYOU ARE PLAYING AGAINST THE COMPUTER";
    cout << "COMPUTER IS JUBMBLING WORD...";
    system("PAUSE");
    system("CLS");
    map easy
    easy = {
        {"Ship","A large boat"},
        {"Ladder","A Piece of Apparatus that helps you climb things"},
        {"Water","What the human body is mainly composed of"}
    };

int main(){
    cout << "\n\n               WELCOME TO WORD JUMBELE";
    cout << "\n                      BY BEN";
    computer()
}

Now it is obvious where the missing brace is.

Answer 3

First of all, map is so-called template class. Which means that you have to pass concrete types in map<key_type, value_type> type in order to specify for which types compiler should generate the code. Note that C++ is strictly typed language.

In order to fill map, you should use:

concreteMap[key] = value 

More about it here: http://www.cplusplus.com/reference/map/map/