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I've attached the project details in a word document.
I'm trying to write the solution algorithm only in pseudo code at the moment before I write the actual code but am pretty stuck. I know I need to read the file then store the information into an array(s) but not sure what the arrays should be and how I should collate the data etc. Any help you can give me will be greatly appreciated thank you!
There isn't much computation involved. It's read the data, put it into the array, and write it out in the format that has been chosen (a report).
Not a lot to pseudo code, imo.
A struct with members to hold each field of each record, is a normal way to go. Then you make an array of the structs you've got, and load the array up with data.
You'll need an input function, perhaps a function to arrange or compute some data as you want or need it to be, and then an output function.
Post your code for this, and let us know what you're stuck on.
If you can't figure out "How do I do this part?", just grab a paper and pencil and do it by hand. Now list the steps you took to do it by hand, in the most simple and efficient way. There's the start to your pseudo code, right there.
Ok so I have it in a structure... I'm unsure of how to compute the data. There's 36 different groups in the report and the only thing I can think of right now is using an If...else statement but that would make 36 different options. Is there anything else I could do for doing that?
Do you have any current code to post?
You could have 17 groups of 2 options ;)Quote:
Originally Posted by drty2
Seriously tho: if you mean is there something that will mean less tedious typing for me, consider it's only 36 repeatable lines. If you mean is there a more "optimal" way to do this (which may mean more, less, or the same amount of typing) then if you can break the options into sets of probabilities (I don't deal with .doc, so I don't know what these groups are), then you can reduce the number of if statements that actually must be processed in a single event cycle -- so it would never have to be more than 4, rather than a high of 36 and a mean of 17.
The relevancy of that depends on the frequency and number of repeated cycles, but of course if the point is educational then practice. :)
We need to see a sample of the input data before we can say how it should be handled.
Normally you have a struct with things like:
name
sex
age
zip code
type of customer
lead
etc.
Then it doesn't matter about "groups", because everybody "fits" into the struct - they all have a name, a sex, an age, etc.
They ALL go into the array, and we manipulate what we want on the report, and where, from there.
Please post your code, and some sample input. The doctors must see the patient to make a diagnosis. :)
Ok I just started to write some code and so far have:
but am unsure how to read the records from the file into the struct. All the searches I've done I've only come up with how to store the data from a user entry.Code:#include <stdio.h>
void readfile();
void main()
{
readfile();
}
void readfile()
{
struct record
{
char gender;
int age;
int lead;
};
FILE *fpin;
fpin = fopen("custsurvey.dat", "r");
if(fpin == NULL)
{
printf("Error opening file");
}
else
{
The data in the file is formatted like this
M 65 4
F 20 2
F 32 5
M 12 1
etc.
You need a function to return a line from the file, probably using read() or fgetc(). read() works with file descriptors and not streams, altho you can map one to the other. After that you want to parse the line with strtok() or sscanf().
I would suggest moving the struct definition to main() (and please make it "int main()", not "void main()". Add a "return 0;" statement at the end of int main(). (for technical reasons I won't go into). Then make or declare a struct (at present you have only defined a struct, but you have none declared (or created)). Then pass a pointer to readfile, and read each record in. You'll need to move the file pointer to main() also.Quote:
Originally Posted by drty2
Using fgets() is excellent, as well, but you will need a buffer to hold it temporarily, and then you'll need to get your data from the buffer - I just think this is more in tune with a raw beginner.Code:#define MaxRecords 4 //up near the very tip top of the program
struct records rec[MaxRecords]; //in main()
//part of readfile()
ok = 1;
while(ok > 0) {
for(i = 0; i < MaxRecords; i++) {
ok = fscanf("%c", rec[i].sex);
if(!ok)
break; //add for all three fscanf's
ok = fscanf("%d", rec[i].age);
ok = fscanf("%d", rec[i].lead);
}
}
The code I'm putting up is not tested - use it for idea's, and know it won't be perfect.
Would this be ok?
And also how would I pass the pointer to the function? Just unsure how I would with the code I have.Code:#include <stdio.h>
#define MAXRECORDS 4
struct record
{
char gender;
int age;
int lead;
};
void readfile();
void main()
{
struct records rec[MAXRECORDS];
readfile();
}
void readfile()
{
FILE *fpin;
fpin = fopen("custsurvey.dat", "r");
if(fpin == NULL)
{
printf("Error opening file");
}
else
{
while(!feof(fpin))
{
for(i = 0; i < MAXRECORDS; i++)
fscanf(fpin, "%c %d %d", &rec[i].gender, &rec[i].age, &rec[i].lead));
}
}
fclose(fpin);
}
Yes, that looks about right. Does it work when you try it out?
A good principle in programming is to write a bit of code, try it out, write a bit more, try it out, fix it, try it out, write a bit more code, etc, etc.
The more advanced form of this is described here:
http://www.agiledata.org/essays/tdd.html
--
Mats
I don't have a compiler at home so haven't been able to test the code yet.
So now say that it does work and all the information is in the struct. How would I collate the data for the report?
There are several sources of compilers - getting one so you can try code out at home is almost essential.
Code::Blocks is an IDE (editor and compiler package) that you can get together with gcc-mingw. Doesn't cost anything more than a bit of downloading.
Or, if you don't mind quite a large download, Microsoft Visual Studio C++ Express Edition is available at no cost from Microsoft themselves.
--
Mats
Never code without one ;)
Nor code without an editor or IDE of kind!
But I have to remind you that you failed to change "void main" to "int main".
Also, the records are stored inside main. How do you think you can use them inside readfile in this case?