This one does the rounding, and allows trailing zeroes, but I can find no way to force right alignment using the "format" function, and I can't find a way to combine the functionality of writef (alignment) with format (rounding and zero display). Also, I have to do the rounding manually before passing the rounded value to writef(). Which means that it will stop once it has found a condition that made your problem true. ^^^ This comes very close to what I want, but unfortunately it does display any trailing zeroes (it will always omit them). Therefore we can write a prolog list as : Head Rest, where Rest is the rest of the list excluding the first element Head. I can accomplish some of these things individually, but not all at once.
For example: 2.500 (trailing zeroes displayed)ģ4.432 (rounded from a much longer decimal value)Īll 3 are right aligned in a 7 character wide space, with 3 decimal places displayed (even when those are zero). My desire is to be able to format numbers that are output such that I am controlling total # decimal digits displayed and also right aligning the numbers in a given character width. Now let’s run the code.I have spent a significant amount of time in the SWI-Prolog documentation and am getting nowhere. Step 3 − Now create one file (extension is *.pl) and write the code as follows − main :- write('This is sample Prolog program'),write(' This program is written into hello_ file'). Now we can see in the prolog console, it shows that we have successfully changed the directory. Step 2 − Select the proper folder and press OK. Step 1 − From the prolog console, go to File > Change Dir, then click on that menu. Now let us see how to run the Prolog script file (extension is *.pl) into the Prolog console.īefore running *.pl file, we must store the file into the directory where the GNU prolog console is pointing, otherwise just change the directory by the following steps − The corresponding output will be as shown below − Note − After each line, you have to use one period (.) symbol to show that the line has ended. To do so, we have to write the command as follows − write('Hello World'). Hello World ProgramĪfter running the GNU prolog, we can write hello world program directly from the console.
Now, we will see how to write a simple Hello World program in our Prolog environment.
In the previous section, we have seen how to install GNU Prolog.
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