#include  <stdio.h>
double fun(double  e)
{ int  i, k;    double  s, t, x;
  s=0;  k=1;  i=2;
/**********found**********/
  x=3.0/4;
/**********found**********/
  while(x > e)
  { s=s+k*x;
    k=k* (-1);
    t=2*i;
/**********found**********/
    x=(t+1)/(t*t);
    i++;
  }
  return  s;
}
main()
{ double  e=1e-3;
  printf("\nThe result is: %f\n",fun(e));
}

#include <stdio.h>

/************found************/
double fun (  int  n )
{   int  a, b, c, k;  double  s;
    s = 0.0;  a = 2;  b = 1;
    for ( k = 1; k <= n; k++ ) {
/************found************/
      s = s + (double)a / b;
       c = a;  a = a + b; b = c;
    }
    return s;
}

main( )
{   int   n = 5;
    printf( "\nThe value of  function is: %lf\n",  fun (  n ) );
}

#include <stdio.h>
#define M 4
int fun (int a[][M])
{
int i,j,max=a[0][0];
  for(i=0;i<2;i++)
     for(j=0;j<M;j++)
        if(max<a[i][j]) 
           max=a[i][j];
  return max;
}

main( )
{  int arr[2][M]={5,8,3,45,76,-4,12,82} ;void NONO ();
   printf("max =%d\n", fun(arr)) ;
   NONO( ) ;
}

void NONO ()
{/* 本函数用于打开文件，输入数据，调用函数，输出数据，关闭文件。 */
  FILE *wf ;
  int arr[][M]={5,8,3,90,76,-4,12,82} ;

  wf = fopen("out.dat","w") ;
  fprintf(wf, "max=%d\n", fun(arr)) ;
  fclose(wf) ;
}