Well, this is a problem:
fillwordnr(f,p[].ptrletter,p[].numbers,lines,nrofline,a,c,string[]);
You have to specify which element of p you want to work with – p[0], p[1], p[i], etc. Assuming nrofline is a valid index for p, you would write
fillwordnr( f, p[nrofline].ptrletter, p[nrofline].numbers, lines, nrofline, a, c, string );
Honestly, based on the code you’ve posted, it’s not clear what you’re trying to accomplish.
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solved How can you use structures in modular programming?