collections in c#( dictionary with the names of the country)

Question

Create dictionary with the names of the country

"de", "Germany";
"sk", "Slovakia";
"us","united states";
"ru","russia";
"hu","hungary";
"pl","poland";

a)display the names of the countries with the key values "hu" and "sk"
b)print the number of items in the dictionary
c)display all the keys in the dictionary
d)display all the values in the dictionary
e)display all the values and keys in the dictionary

Vulpes · Answer

Try this: using System; using System.Collections.Generic; class Program { static void Main() { Dictionary countries = new Dictionary (); countries.Add(de Germany); countries.Add(sk Slovakia); countries.Add(usunited states); countries.Add(rurussia); countries.Add(huhungary); countries.Add(plpoland); Console.WriteLine('hu' represents {0} countries[hu]); Console.WriteLine('sk' represents {0} countries[sk]); Console.WriteLine(The number of items in the dictionary is {0} countries.Count); Console.WriteLine(
The country codes are
); foreach(string key in countries.Keys) Console.WriteLine( {0} key); Console.WriteLine(
The countries are
); foreach(string value in countries.Values) Console.WriteLine( {0} value); Console.WriteLine(
The countries with their codes are
); foreach (KeyValuePair kvp in countries) { Console.WriteLine( {0} has a code of '{1}' kvp.Value kvp.Key); } Console.ReadKey(); } }

Sinu Joseph · Answer

Thank u Vulpes ...

Sinu Joseph · Answer

can anybody help me to find out the following questions 1) input a sentance and print the frequency of words repeating in the sentance. use arraylist or hash table 2) create a linked list . add new elements and delete existing elements and traverse through the list 3)write a prgm that accept a postfix expression nd determines its value. input specification: the input to the prm will consist os a well formed postfix expresion terminated by a newline charector ('
'). the expression will consist of operands and operators seperated by a single sapace . this possible operators are + Adddition - subtratoin * multiplication / integer division % remainder ^ exponentiation operants will be positive integers input will not be such tht it will cause an overflow or underflow in an integer variable output spec output should be the value of the expression follwed by a newline charector example input 10 20+ output 30 input 9 8+3 5 - / output -8 input 7 3 2 ^ % output 8