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The document discusses typecasting in C#. It describes implicit and explicit typecasting. Implicit typecasting converts lower data types to higher types automatically, while explicit typecasting converts higher to lower types and requires a cast. It discusses built-in conversion methods like ToInt32() and Parse() for converting between types like string to integer. Examples are provided to demonstrate parsing strings to perform mathematical operations and converting between types.
![• we can convert one datatype into different datatypes.
• it is classified into 2 types
• 1.implicit type casting
• 2.explicit type casting
• 1.implicit type casting:
• In this we convert lower datatypes are converts into higher data types.it is also called
as internal type casting. It is under control of clr;
• using System;
• namespace implicittypecastin_exm
• { class Program
• { static void Main(string[] args)
• { int i = 545454;//4 bytes
• long l = i;//8 bytes
• Console.WriteLine("the long value is:" + l.ToString());
• Console.ReadLine();
• } } }](https://image.slidesharecdn.com/19c-170711101242/85/19c-2-320.jpg)
![• 2.Explicit type casting:
• In this we convert higher datatypes converts into lower datatypes. it is also called as
external type casting. this is under control of the programmer
• using System;
• namespace implicittypecastin_exm
• { class Program
• { static void Main(string[] args)
• { long l = 454545454;//8 bytes
• int i = l;//4 bytes
• Console.WriteLine("the int value is:" + i.ToString());
• Console.ReadLine();
• } } }
• the above example gives error. cant implicit convert higher to lower datatypes. we can
overcome this problem.explit type casting classified into](https://image.slidesharecdn.com/19c-170711101242/85/19c-3-320.jpg)
![• structure is a collection of predefined methods
• 1.minvalue()
• 2.maxvalue()
• 3.tostring()
• 4.parse()
• working with parse() is called as parsing. parse() method can be used only to convert
from strings into int. tostring() can be used only to convert from int to string.
• ex: print the limits of datatypes.
• static void Main(string[] args)
• { Console.WriteLine(byte.MinValue.ToString());
• Console.WriteLine(byte.MaxValue.ToString());
• Console.WriteLine(int.MinValue.ToString());
• Console.WriteLine(int.MaxValue.ToString());
• Console.ReadLine(); }](https://image.slidesharecdn.com/19c-170711101242/85/19c-7-320.jpg)
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- 2. • we can convert one datatype into different datatypes. • it is classified into 2 types • 1.implicit type casting • 2.explicit type casting • 1.implicit type casting: • In this we convert lower datatypes are converts into higher data types.it is also called as internal type casting. It is under control of clr; • using System; • namespace implicittypecastin_exm • { class Program • { static void Main(string[] args) • { int i = 545454;//4 bytes • long l = i;//8 bytes • Console.WriteLine("the long value is:" + l.ToString()); • Console.ReadLine(); • } } }
- 3. • 2.Explicit type casting: • In this we convert higher datatypes converts into lower datatypes. it is also called as external type casting. this is under control of the programmer • using System; • namespace implicittypecastin_exm • { class Program • { static void Main(string[] args) • { long l = 454545454;//8 bytes • int i = l;//4 bytes • Console.WriteLine("the int value is:" + i.ToString()); • Console.ReadLine(); • } } } • the above example gives error. cant implicit convert higher to lower datatypes. we can overcome this problem.explit type casting classified into
- 4. • 3 types : • 1.c++ style type casting • 2.parsing • 3.converting • 1.c++ style type casting: • in this type casting higher datatypes are converts into lower datatypes. • ex: • long l = 454545454;//8 bytes • int i =(int) l;//4 bytes • Console.WriteLine("the int value is:" + i.ToString()); • Console.ReadLine(); • 2.working with parsing: • as .net all the datatypes are predefined structures. • int i; • int-structure • i-structure variable.
- 5. C# Type Conversion Methods C# provides the following built-in type conversion methods: Methods & Description ToBoolean Converts a type to a Boolean value, where possible. ToByte Converts a type to a byte. ToChar Converts a type to a single Unicode character, where possible. ToDateTime Converts a type (integer or string type) to date-time structures. ToDecimal Converts a floating point or integer type to a decimal type. ToDouble Converts a type to a double type. ToInt16 Converts a type to a 16-bit integer. ToInt32 Converts a type to a 32-bit integer.
- 6. ToInt64 Converts a type to a 64-bit integer. ToSbyte Converts a type to a signed byte type. ToSingle Converts a type to a small floating point number. ToString Converts a type to a string. ToType Converts a type to a specified type. ToUInt16 Converts a type to an unsigned int type. ToUInt32 Converts a type to an unsigned long type. ToUInt64 Converts a type to an unsigned big integer.
- 7. • structure is a collection of predefined methods • 1.minvalue() • 2.maxvalue() • 3.tostring() • 4.parse() • working with parse() is called as parsing. parse() method can be used only to convert from strings into int. tostring() can be used only to convert from int to string. • ex: print the limits of datatypes. • static void Main(string[] args) • { Console.WriteLine(byte.MinValue.ToString()); • Console.WriteLine(byte.MaxValue.ToString()); • Console.WriteLine(int.MinValue.ToString()); • Console.WriteLine(int.MaxValue.ToString()); • Console.ReadLine(); }
- 8. • 2.example on parsing • 1.take the form • 2.add 3 labels,3 textboxes,1 button control • private void button1_Click(object sender, EventArgs e) • { textBox3.Text = textBox1.Text + textBox2.Text; } • o/p:1010 • it gives concatenation error • ex: • "10"+"10"=1010 • 10+10=20; • we can overcome this problem using parsing method.. • textBox3.Text = (int.Parse(textBox1.Text) +int.Parse(textBox2.Text)).ToString();
- 9. • 2 nd method: • private void button1_Click(object sender, EventArgs e) • { // textBox3.Text = (int.Parse(textBox1.Text) +int.Parse(textBox2.Text)).ToString(); • int a, b, c; • a = int.Parse(textBox1.Text); • b = int.Parse(textBox2.Text); • c = a + b; • textBox3.Text = c.ToString(); • }
- 10. • Working with converting method: • working with convert class is called as converting. • convert is the part fcl(frame work class library) • convert is the collection of predefined methods • convert.toint16()-short-2 bytes • convert.toint32()-int-4 bytes • convert.toint64()-long-8 bytes • convert.tochar() • convert.tobyte() • convert.toboolean() • convert.tofloat() • convert.todouble()
- 11. • Example on converting: • take the form • 2.add 3 labels,3 textboxes,1 button control • private void button1_Click(object sender, EventArgs e) • { textBox3.Text = textBox1.Text + textBox2.Text; } • o/p:1010 • it gives concatenation error • ex:"10"+"10"=1010 • 10+10=20; • we can overcome this problem using parsing method.. • textBox3.Text = (convert.toint32(textBox1.Text) +convert.toint32(textBox2.Text)).ToString();
- 12. • 2 nd method: • private void button1_Click(object sender, EventArgs e) • { • // textBox3.Text = (int.Parse(textBox1.Text) +int.Parse(textBox2.Text)).ToString(); • int a, b, c; • a = convert.toint16(textBox1.Text); • b = convert.toint16(textBox2.Text); • c = a + b; • textBox3.Text = c.ToString(); • }
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