Fortran What Does the Fortran Statement 'IF ( IP - I1 ) 180, 170, 180' Mean?

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The discussion centers on the interpretation of an arithmetic IF statement in Fortran. The statement "IF ( IP - I1 ) 180, 170, 180" directs the program flow based on the result of the expression IP - I1. If the result is less than zero, the program jumps to statement 180; if it equals zero, it goes to statement 170; and if greater than zero, it again jumps to statement 180. The use of this type of statement indicates that the code is likely outdated, as arithmetic IF statements are considered a legacy feature in Fortran programming.
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Hi all,

What is the meaning of the following Fortran statement

IF ( IP - I1 ) 180, 170, 180

kindly help,
thank u,
 
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This is an "arithmetic IF" statement.

If IP - I1 < 0, go to statement 180.
If IP - I1 = 0, go to statement 170.
If IP - I1 > 0, go to statement 180.

You must be reading very old code. :smile:
 

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