Thread: Reading data from a file

Hi!

I'm trying to read some data from a file. Particularly, this file contains different statistics of different countries, as it follows:

"Country","Area","Density","HDI"
"France","643801.27","121.5","0.903"
"Italy","301230.45","201.3","0.895"
"Germany","357022.1","232.9","0.943"

Note: all statistics correspond to float data. Moreover, it contains more rows and columns.

Now I'm attempting to store each country statistics in an array. Therefore, after having opened the file, this is my code.

Code:

float France[3];
float Germany[3];
float Italy[3];
float store[9];

int i=0;

while(i<10){
  fscanf(file,"\"%f\"",store[i];
  i++;
}

for(i=0;i<3;i++){
  France[i]=store[i];
  Italy[i]=store[i+3];
  Germany[i]=store[i+6];
}

However, when I print the arrays France, Italy and Germany it prints 0.000000, so I think fscanf is not being well used. Why? What should I do?

Thank you very much.

Note: all statistics correspond to float data.

No. There is a head line. And every further line begins with a field containing the country name. How is this ever float data?

Moreover, it contains more rows and columns.

Then you have to consider this in your program code.

so I think fscanf is not being well used

The compiler should have at least warned you about passing the float instead of passing the address of the float that receives the value.




Consider to read the data line by line.
Ignore lines that don't contain data.
Tokenize the lines.
Ignore tokens that don't contain data.
Convert tokens that contain data.

Country isn't a float, it's a string and you should read it as a string.
Also you should skip the first line.
Do you have to use different arrays ? It would be easier to use an array of structs.

Code:

    struct Data
    {
        char  country[32];
        float area,
              density,
              hdi;
    };

    struct Data countries[10];