datatype conversion in c sharp Arabic #06

Part 06 - C# Tutorial - Datatype conversions

Suggested Videos
Part 03 - String type
Part 04 - Operators
Part 05 - Nullable Types

In this video, we will discuss
1. Implicit conversions
2. Explicit Conversions
3. Difference between Parse() and TryParse()

Implicit conversion is done by the compiler:
1. When there is no loss of information if the conversion is done
2. If there is no possibility of throwing exceptions during the conversion

Example: Converting an int to a float will not loose any data and no exception will be thrown, hence an implicit conversion can be done.

Where as when converting a float to an int, we loose the fractional part and also a possibility of overflow exception. Hence, in this case an explicit conversion is required. For explicit conversion we can use cast operator or the convert class in c#.

Implicit Conversion Example
using System;
class Program
{
  public static void Main()
{
  int i = 100;

// float is bigger datatype than int. So, no loss of
// data and exceptions. Hence implicit conversion
  float f = i;

  Console.WriteLine(f);
}
}

Explicit Conversion Example
using System;
class Program
{
  public static void Main()
{
  float f = 100.25F;

// Cannot implicitly convert float to int.
// Fractional part will be lost. Float is a
// bigger datatype than int, so there is
// also a possiblity of overflow exception
// int i = f;

  // Use explicit conversion using cast () operator
  int i = (int)f;

// OR use Convert class
// int i = Convert.ToInt32(f);

  Console.WriteLine(i);
}
}

Difference between Parse and TryParse
1. If the number is in a string format you have 2 options - Parse() and TryParse()
2. Parse() method throws an exception if it cannot parse the value, whereas TryParse() returns a bool indicating whether it succeeded or failed.

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