C Programming Question

Do you know, in advance, the number of doubles per line? If so you could use a sequence of reads like:

fscanf(%d %d %d %d %d %d %d, &var1, &var2, &var3, &var4, &var5, &var6, &var7);
fscanf(%d %d %d %d %d %d %d, &var1, &var2, &var3, &var4, &var5, &var6, &var7);
fscanf(%d %d %d, &var1, &var2, &var3);
fscanf(%d %d %d, &var1, &var2, &var3);

with appropriate code between the reads to put the variables into your arrays.

If you don't know the format of the file in advance things are a little more tricky if you're restricted to fscanf().

Thanks for the reply, but I need to try to read in that data using for loops. I know how times each one has to iterate though, so it should be easier.
I have tried this so far:

double Tpres[NP], Psat[NP], Tsat[NH], HGsat[NH];

FILE *data;
data = fopen("me30-proj10-data.txt","r" );
if(data == NULL)
{ printf("There was an error opening the file.\n" );

}
for(int count1 = 0; count1 <= NP; count1++)
{
fscanf(data, "%lf", Tpres[count1]);
}
for(int count2 = 0; count2 <= NP; count2++)
{
fscanf(data, "%lf", Psat[count2]);
}
for(int count3 = 0; count3 <= NH; count3++)
{
fscanf(data, "%lf", Tsat[count3]);
}
for(int count4 = 0; count4 <= NH; count4++)
{
fscanf(data, "%lf", HGsat[count4]);
}


But, every time I run it, I get an error: "An Access Violation (Segmentation Fault) raised in your program", during the first for loop.
Any ideas?

That's easy (I think!). You're counting from 0 to NP (i.e. NP + 1 times) but your array only has NP elements. Classic C mistake. Try changing the "<=" to "<" in the for loops.

Just seen your second post - that too!