1、

#include <stdio.h>

int main(void)
{
    FILE *fp;
    int lines = 0;
    char name[128];
    double height, weight;
    double hsum = 0, wsum = 0;
    
    if((fp = fopen("a.txt", "r")) == NULL)
        printf("\aFile open failed.\n");
    else
    {
        while(fscanf(fp, "%s%lf%lf", name, &height, &weight) == 3
 
)
        {
            printf("%-10s %5.1f %5.1f\n", name, height, weight);
            lines++;
            hsum += height;
            wsum += weight;
        }
        puts("\n==================================\n");
        printf("average   %5.1f %5.1f\n", hsum/lines, wsum/lines);
        fclose(fp); 
    }
    
 
return 0;
}

#include <stdio.h>

int main(void)
{
    FILE *fp;
    int lines = 0;
    char name[128];
    double height, weight;
    double hsum = 0, wsum = 0;
    
    if((fp = fopen("a.txt", "r")) == NULL)
        printf("\aFile open failed.\n");
    else
    {
        while(fscanf(fp, "%s%lf%lf
 
", name, &height, &weight) != EOF)
        {
            printf("%-10s %5.1f %5.1f\n", name, height, weight);
            lines++;
            hsum += height;
            wsum += weight;
        }
        puts("\n==================================\n");
        printf("average   %5.1f %5.1f\n", hsum/lines, wsum/lines);
        fclose(fp); 
    }
    return 0;
}