#include <stdio.h>
#define N 100
 
int aryInput(int*a)
{
  int i=0;
 
  while(1) {
    printf("in[%d]=",i);
    scanf("%d",a+i);
    if(a[i]<0)return i;
    i++;
  }
}
 
void arySort(int*a,int n)
{
  int i,j,t;
 
  for(i=0; i<n-1; i++) {
    for(j=i+1; j<n; j++) {
      if(a[i]>a[j]) {
        t=a[i];
        a[i]=a[j];
        a[j]=t;
      }
    }
  }
}
 
double aryMedian(int*a,int n)
{
  return (n%2)?a[n/2]:(a[n/2-1]+a[n/2])/2.0;
}
 
int main()
{
  int ary[N],n,i;
 
  n=aryInput(ary);
  arySort(ary,n);
  printf("中央値 = %g\n",  aryMedian(ary,n));
 
  return 0;
}

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NAo2CjcKOQoyCjMKLTE=

4
6
7
9
2
3
-1