Thread: calculate the average value from a text file

Hello, I try to write a code to calculate the average value from a text file but the dumb thing is I has to count the no. of data manually to initialize the array. (here is 1000).

Here is the code:

Code:

#include <stdio.h>
#include <stdlib.h>


int main(){
    
    
    FILE *p; 
    p = fopen("myfile.txt", "r");


    
    int Array[1000];
    int i;
    double sum=0.0;
    
    


   for (i = 0; i < 1000; i++)


{
        fscanf(p, "%d", &Array[i] );
        
        printf("Number is: %d\t %d\n\n", Array[i],i);
        
        sum = sum + Array[i];
}
        printf("The average weight is %lf",sum/1000);


        fclose(p);


        return 0;
}

It works but i just want it to count the no. of data automatically. So i search something that capable to count the no. :

Code:

#include<stdio.h>


int main(void)
{
    FILE *p;
    char ch;
    int w=0;
   
    p=fopen("myfile.txt","r");
    if(p==NULL)
     {
         printf("file not found");
      }
    else
      {
          ch=fgetc(p);
          while(ch!=EOF)


{
                 
                  printf("%c",ch);
                        if(ch==' '||ch=='\n')
                          {
                               w++;
                          }
                               ch=fgetc(p);
}
                               printf("\nWords in a file are=%d",w);
     }
                              fclose(p);
                              getch();


return 0;
}

How do I combine the two and make use of the 'w' in the first program? I've tried but fail. Hope someone can guide me.

Originally Posted by Salem

You could do something like

Code:

int count = 0, value, sum = 0;
while ( fscanf(p, "%d", &value ) == 1 ) {
  sum += value;
  count++;
}

Thank you so much! It works well !

#include <stdio.h>

Code:

int main(){


FILE *fpr; 
    fpr = fopen("elephant_seal.txt", "r");




int count = 0, value;


double sum = 0.0;


while ( fscanf(fpr, "%d", &value ) == 1 ) {
  sum += value;
  count++;
}


printf("The average weight is %lf",sum/count);


        fclose(fpr);


        return 0;


}

Thank you! it works well. I am obsessed in assigning those value into array but turn out it is not necessary.