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Compare( ) |
  
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Compare( ) |
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The function compares 2 values and return 1, 0, or -1 corresponding to "greater than", "equal to", and "smaller than" respectively. If any of the arguments is .Null., .Null. will be returned.
In Visual FoxPro string comparison using the native operators "<", ">" and "=" will be carried out up to the last character of the right hand side. This behaviour can be a trap for most people. You may keep away from this trap by using Compare( ).
Using operations >, < and =:
Comparison |
Returned Value |
Remark |
"ABC"="AB" |
.T. |
In Visual FoxPro string comparison will be carried out up to the last character of the right hand side. Therefore "C" at the left hand side will be ignored |
"ABC"<"AB" |
.F. |
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"ABC">"AB" |
.F. |
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"AB"="ABC" |
.F. |
In Visual FoxPro string comparison will be carried out up to the last character of the right hand side. Therefore "C" at the right hand side will be taken into account |
"AB"<"ABC" |
.T. |
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"AB">"ABC" |
.F. |
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"AB"="AB" |
.T. |
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3 > 4 |
.F. |
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3 = 3 |
.T. |
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4 < 3 |
.F. |
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.Null. > 3 |
.Null. |
Using the Compare( ) function:
Comparison |
Returned Value |
Compare("ABC","AB") |
1 |
Compare("AB","ABC") |
-1 |
Compare("AB","AB") |
0 |
Compare(3, 4) |
-1 |
Compare(3, 3) |
0 |
Compare(4, 3) |
1 |
Compare(.Null., 3) |
.Null. |
Syntax
Compare(eValue1,eValue2)
Returns
Numeric
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