#include <stdio.h>
#include <string.h>
#define N 20
#define M 8
void fillblanks(char *s, int x);
float calcavg(FILE *f);
void writeheadings(FILE *f);
void writetotals(FILE *f, int n, float mo);
void getdata();
main()
{
        FILE *fp,*data;
        char ch,epitheto[N],onoma[N];
        float grade[M],average,v1;
        int i,j=0;

        getdata();
        fillblanks(epitheto, N);
        fillblanks(onoma, N);
        fp=fopen("eisagwgi.txt","r");
        writeheadings(data);
        while(fscanf(fp,"%s",epitheto)!=EOF)
        {
                fscanf(fp,"%s ",&onoma);

                average=calcavg(fp);
                data=fopen("data.txt","a");
                fprintf(data,"%s",epitheto);
                for(i=0;i<N-strlen(epitheto);i++)
                {
                        fprintf(data," ");
                }
                fprintf(data,"%s",onoma);
                for(i=0;i<N-strlen(onoma);i++)
                {
                        fprintf(data," ");
                }
                fprintf(data,"%.3f",average);
                fprintf(data,"\n");
                fclose(data);
                for(i=0;i<M;i++)
                {
                        fscanf(fp,"%f",&v1);
                }
                j++;
        }
        fclose(fp);

        i=0;
        data=fopen("data.txt","r");
        v1=0;
        average=0;
        i=0;
        fseek(fp, 51, 0);
        while( fscanf(data, "%s%s%f", epitheto, onoma, &average)!= EOF )
        {
               v1+=average;
               i++;

        }
        average=v1/i;
        printf("average=%f",average);
        fclose(data);
        writetotals(&data,i,average);
        system("pause");
}

void getdata() {
  FILE *fp;
  char epitheto[N];
  char onoma[N];
  float grade;
  int i;

  fp = fopen("eisagwgi.txt", "w");
  printf("Dwse to epitheto: ");
  scanf("%s", epitheto);
  while (strcmp(epitheto, "*"))
  {
        fprintf(fp, "%s", epitheto);
        printf("Dwse onoma: ");
        scanf("%s", onoma);
        fprintf(fp, " %s ", onoma);
        for (i=0; i<M; i++)
        {
                printf("Dwse thn %di vathmologia: ", i+1);
                scanf("%f", &grade);
                fprintf(fp, "%f ", grade);
        }
        fprintf(fp, "\n");
        printf("Dwse to epitheto: ");
        scanf("%s", epitheto);
  }
  fclose(fp);
}
void fillblanks(char *s, int x)
{
        int i;
        for(i=strlen(s)+1;i<x;i++)
        {
                s[i]=' ';
        }
}
float calcavg(FILE *f)
{
        char name[N],last[N];
        FILE *data;
        float x,sum=0;
        int i;
        f=fopen("eisagwgi.txt","r");
        fscanf(f,"%s ",name);
        fscanf(f,"%s ",last);
        for(i=0;i<M;i++)
                {
                        fscanf(f,"%f ",&x);
                        printf("To x einai: %f\n",x);
                        sum+=x;
                }
                fclose(f);
                return(sum/M);
}
void writeheadings(FILE *f)
{
        int i;
        f=fopen("data.txt","w");
        fprintf(f,"Epitheto:");
        for(i=0;i<N-strlen("epitheto:");i++)
        fprintf(f," ");
        fprintf(f,"Onoma:");
        for(i=0;i<N-strlen("onoma:");i++)
        fprintf(f," ");
        fprintf(f,"Mesos Oros:");
        fprintf(f,"\n");
        fclose(f);
}
void writetotals(FILE *f, int n, float mo)
{
        f=fopen("data.txt","a");
        fprintf(f,"\nOi foitites einai: %d\n",n);
        fprintf(f,"O mesos oros tis taksis einai: %f\n",mo);
        fclose(f);
}