### Use the logical functions

2000-02-04 Functions 0 57

Most users take advantage of the logical function **IF(logical_test,if_true,if_false)** to make Excel take a logical decision.

If you want to perform more complex comparisions you can add the logical functions **AND()**, **OR()** and **NOT()** when you use the **IF()**-function.

Here are some examples on how to use these functions:

**=IF(logical_test,if_true,if_false)**

This function performs a simple logical test, you can use one of the following compare methods to create the logical test:

Symbol | Logical test |
---|---|

= |
Equal to |

<> |
Not equal to |

> |
Greater than |

>= |
Greater than or equal to |

< |
Less than |

<= |
Less than or equal to |

Logical function | Returns |
---|---|

AND() |
TRUE if all logical tests returns TRUE |

OR() |
TRUE if one logical test returns TRUE |

NOT() |
TRUE if the logical test returns FALSE |

ISERR() |
TRUE if the cell value is an error value different from #N/A |

ISERROR() |
TRUE if the cell value is an error value |

ISNONTEXT() |
TRUE if the cell value not is a text |

ISNA() |
TRUE if the cell value equals the error value #N/A |

ISLOGICAL() |
TRUE if the cell value is a logical value |

ISREF() |
TRUE if the cell value is a cell reference |

ISNUMBER() |
TRUE if the cell value is a number |

ISTEXT() |
TRUE if the cell value is a text |

ISBLANK() |
TRUE if the cell is empty (blank cell) |

*=AND(logical1,logical2...)*: this function can perform up to 30 logical test and returns TRUE if ALL of the logical test returns TRUE, else it returns FALSE.

*=OR(logical1,logical2...)*: this function can perform up to 30 logical test and returns TRUE if ONE of the logical test returns TRUE, else it returns FALSE.

*=NOT(logical)*: this function will reverse the result from another logical function, and is often used to make it easier to understand the logical function.

**Examples:**

=IF(A1>=10,"The value in A1 is larger than 10","Not larger than 10") =IF(ISBLANK(A1),"This cell must be filled in !","") =IF(ISTEXT(A1),"This cell must be filled in with a number!","") =IF(AND(A1>10,B1>20,C1>30),"All values are greater than","One or more values is less than") =IF(OR(A1>10;B1>20;C1>30);"One or more values is greater than";"All values are less than") =IF(NOT(A1>100),"Less than 100","Greater than 100")