fun的功能是:计算级数的前N项之和,直到下一项大于q, q的值通过形参传入.S=2/1+3/2+4/3/+..+(n+1)/n
若q=50.0,则函数的值为50.4115587
#include <conio.h>
#include <stdio.h>
double  fun( double q )
{ int n; double  s;
  n = 2;
/************found************/
  s = 2.0
  while (s<=q)
  {
/************found************/
    s=s+ (n+1)/n;
    n++;
  }
  printf("n=%d\n",n);
  return s;
}
main ( )
{  clrscr( );
   printf("%f\n", fun(50));
}