int i = ...; F(i); if (i = 0) // Bug: the test should be (i == 0) G();results in a compile-time error because the expression i = 0 is of type int, and if statements require an expression of type bool. The char type is used to represent Unicode characters. A variable of type char represents a single 16-bit Unicode character. The decimal type is appropriate for calculations in which rounding errors caused by floating point representations are unacceptable. Common examples include financial calculations such as tax computations and currency conversions. The decimal type provides 28 significant digits. The table below lists the predefined types, and shows how to write literal values for each of them.

Type | Description | Example |
---|---|---|

object | The ultimate base type of all other types | object o = null; |

string | String type; a string is a sequence of Unicode characters | string s = "hello"; |

sbyte | 8-bit signed integral type | sbyte val = 12; |

short | 16-bit signed integral type | short val = 12; |

int | 32-bit signed integral type | int val = 12; |

long | 64-bit signed integral type | long val1 = 12; long val2 = 34L; |

byte | 8-bit unsigned integral type | byte val1 = 12; |

ushort | 16-bit unsigned integral type | ushort val1 = 12; |

uint | 32-bit unsigned integral type | uint val1 = 12; uint val2 = 34U; |

ulong | 64-bit unsigned integral type | ulong val1 = 12; ulong val2 = 34U; ulong val3 = 56L; ulong val4 = 78UL; |

float | Single-precision floating point type | float val = 1.23F; |

double | Double-precision floating point type | double val1 = 1.23; double val2 = 4.56D; |

bool | Boolean type; a bool value is either true or false | bool val1 = true; bool val2 = false; |

char | Character type; a char value is a Unicode character | char val = 'h'; |

decimal | Precise decimal type with 28 significant digits | decimal val = 1.23M; |

- Two expressions of type int are considered equal if they represent the same integer value.
- Two expressions of type object are considered equal if both refer to the same object, or if both are null.
- Two expressions of type string are considered equal if the string instances have identical lengths and identical characters in each character position, or if both are null.

using System; class Test { static void Main() { string s = "Test"; string t = string.Copy(s); Console.WriteLine(s == t); Console.WriteLine((object)s == (object)t); } }produces the output

True Falsebecause the first comparison compares two expressions of type string, and the second comparison compares two expressions of type object.

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