structure member values

[breed]

Can some one help me out plz
this program has two structures the first is a file that has valid census iformation in it, and the 2nd is to display information based on the first struct.
My problem is how can i gain the percentage of 1 to 2 occupants
that live in a street.
as you can't logically compare using the assertion or equality operators.



struct data {
char str_name[20];
int hse_num;
int occups;
};

struct totals {
char str_name[20];
int num_of_hses;
int total_occups;
int av_num_of_occups;
float per_1-2_occups;
float per_3-4_occups;
float per_5+_occups;
};

void main()
{
FILE *fp;
struct data *fp1, *fp2;
int count=0;

if( (fp = fopen(“CENSUS.DAT”, “rb”) ) == NULL)
{
printf(“Unable to open file”);
return;
}

while( strcmp(fp1->str_name, “\0”) )
{
fp2 = fp1 + 1;
count++;

while(strcmp(fp2->str_name, “\0”) )
{
if( strcmp(fp1->str_name, fp2- >str_name) ==1)
accum_totals();

//other coding in here


}
fp2++;
}
fp1++;
void display_info();
count=0;
}



void accum_totals(struct totals *in_str)
{
int
strcpy(data.str_name, total.str_name)
num_of_hses = count;
total_occups = data.occups;
av_num_of_occups = data.occups / count
per_1-2_occups????



frustrated

breed

[Troll_King]

The code has some errors.

void main() { .... }

This is an error. Your point of entry should look like:

int main()
{
   //code goes here
   return 0;
}

I can see a little bit of logic but I don't think it works. You have to scan the records into variables before you do any comparisons on data.

struct data record

//open file
int counter = 0;
//part of necessary code
while( fscanf("%d%s%s", &record.num_of_hses, ...) != EOF)
{
//increment counter each cycle
}

//counter is the number of records

Basically I'm a little lost with what you are trying to accomplish with this code. It does not make much sense at this stage.

Might help to show what the datafile looks like.

[breed]

Sorry about the crap code that i sent in.
But I'm going to attemp to explain myself a bit more clearly.
so plz forgive me if i get some of the jargon wrong

I am trying to write a program that has a file already validated and is sorted by street name-
struct census {
char street_name[20];
int house_number;
int occupants;
};

void main()
{
int count=0; //using count as iteration marker
{
//.................................................. ......................
..........................some code
}
Now from this struct i need to colate the following info,

street name which is easy strcpy(census.street_name, new_struct.street_name);

the number of houses in a street, the total number of occupants that live on a street and the average number of occupants per house. This i thought i could do through a function.
this i think i can work out.
But (the big but!!)

I also need the percentage of 1-2 people living in a house
percentage of 3-4 " " " "
percentage of 5+ " " " "

Any idea's are all welcome

can i get the percentages by using the comparison <>operators or == operators

[Troll_King]

Start like this:

//header files
struct census
 { 
     char street_name[20]; 
     int house_number; 
     int occupants; 
}; 

//notice it's int main, not void main
int main() 
{ 
    struct census record[50];
     FILE *fptr;
     int count=0; //using count as iteration marker
     //open the file
     fptr = fopen("filepath","r");
     if(fptr == NULL) exit(1); 
     while(fscanf(fptr, "format specifiers", variables) != EOF)
     { 
     //load records
     //........................................................................ 
     ..........................some code
    //count += 1; //increment count
     } 
     //Now from this struct i need to colate the following info, 
     return 0;
}

You are required to load the data from the file into variables (ie records) in order to make comparisons on it. If you do not understand this from this code than you need to read several chapters such as: 'file I/O' and 'structures'.