Ejemplo044.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#define N 50
 
int main(int argc, char *argv[])
{
    int i, n, c;
    double *x, m;
    FILE *fp;
    char filename[N];
    if(argc==2)
        strcpy(filename, argv[1]);
    else
        strcpy(filename, "Prueba.txt");
    fp = fopen(filename, "rt");
    if(fp==NULL)
        return 1;
    fscanf(fp, "%d\n", &n);
    printf("n = %d\n", n);
    x = (double*)malloc(n*sizeof(double));
    if(x==NULL)
    {
        fclose(fp);
        return 2;
    }
    for(i=0, m=0; i<n; i++)
    {
//      fscanf(fp, "%d\t%lf\n", &c, &x[i]);
        fscanf(fp, "%d\t%lf\n", &c, x+i);
        printf("x[%d] = %lf\n", c, x[i]);
        m+=x[i];
    }
    m/=n;
    printf("Media = %lf\n", m);
    fclose(fp);
    return 0;
}