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

Sinu Joseph

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

3 Replies

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Vulpes13y ago
Accepted 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("us","united states");
countries.Add("ru","russia");
countries.Add("hu","hungary");
countries.Add("pl","poland");

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("\nThe country codes are\n");
foreach(string key in countries.Keys) Console.WriteLine(" {0}", key);

Console.WriteLine("\nThe countries are\n");
foreach(string value in countries.Values) Console.WriteLine(" {0}", value);

Console.WriteLine("\nThe countries with their codes are\n");

foreach (KeyValuePair kvp in countries)
{
Console.WriteLine(" {0} has a code of '{1}'", kvp.Value, kvp.Key);
}

Console.ReadKey();
}
}
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Sinu Joseph13y ago
Thank u Vulpes...
0
Sinu Joseph13y ago
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 ('\n'). 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
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