Ошибка сегментации - C (СИ) (148826)

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
void Sort(double *num, int size) {
  int i, j, temp;
  for (i = 0; i < size; i++) {
    for (j = (size - 1); j > i; j--) {
      if (num[j-1] > num[j]) {
        temp = num[j-1];
        num[j-1] = num[j];
        num[j] = temp;
      }
    }
  }
}
int main(void) {
    FILE *in1, *in2, *out;
    int n1=0, n2=0;
    double *a;
    double m;
    int i;
    double r;
    int n=0;
    char s1[100], s2[100], s3[100];
    printf("Name1: \n");
    scanf("%s",s1);
    printf("Name2: \n");
    scanf("%s",s2);
    printf("Name3: \n");
    scanf("%s",s3);
    in1=fopen(s1,"r");
    in2=fopen(s2,"r");
    out=fopen(s3,"w");
 
    if((in1==NULL)||(in2==NULL))
    {
      printf("error");
      fclose(in1);
      fclose(in2);
      return -1;
    }
 
    if((fscanf(in1,"%lf",&r))!=1){
    printf("error");
    fclose(in1);
    return -2;
    }
    else n1++;
    if((fscanf(in2,"%lf",&m))!=1){
      printf("error");
    fclose(in2);
    return -3;
    }
    else n2++;
    while(!feof(in1))
    {
        fscanf(in1,"%lf",&r);
        n1++;
    }
    while(!feof(in2))
    {
        fscanf(in2,"%lf",&r);
        n2++;
    }
    n=n1+n2;
    a = (double*)malloc(n*sizeof(int));
    for (i=0; i<n1; i++){
    fscanf(in1, "%lf", &r);
    a[i]=r;
    }
    for (i=n1; i<n; i++){
    fscanf(in2, "%lf", &r);
    a[i]=r;
    }
    Sort(a, n);
    for (i=0; i<n; i++){
      printf("%lf\n", &a[i]);
      fprintf(out, "%lf\n", &a[i]);
     }
     fclose(in1);
     fclose(in2);
     fclose(out);
     return 0;
}