#include<stdlib.h>
#include<stdio.h>
#include<time.h>
void fun(int a[],int n, int *max, int *d)
{
  int i,k=a[0],t=0;
    for(i=0;i<n;i++)
    {if(k<a[i])
            k=a[i];
        t=i;}
    *max=k;
    *d=t;


}
void main()
{
  FILE *wf;
  int i, x[20], max,  index, n=10;
  int y[20]={4,2,6,8,11,5};
  srand((unsigned)time(NULL));
  for(i=0;i<n;i++)
    {
     x[i]=rand()%50;
     printf("%4d",x[i]);    /*输出一个随机数组*/
    }
  printf("\n");
  fun(x,n,&max,&index);
  printf("Max=%5d,Index=%4d\n",max,index);
/******************************/
  wf=fopen("out.dat","w");
  fun(y,6,&max,&index);
  fprintf(wf,"Max=%5d,Index=%4d",max,index);
  fclose(wf);
/*****************************/
}

fun函数里if判断到k<a[i]后面执行的两句要用括号括起来，否则每次都会执行t=i