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#include <stdio.h>
#include <math.h>
#define pi 3.1415926
void main()
{ double i,j,m,n;
  j=pi*50*i;
  m=2*cos(j)*cos(j);
  n=-i/0.1128;
  for(i=1.0;i <1000.0;i++)
  {       
if(m==exp(n))
printf("i=%6.2f\n",i);
  }
}
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j=pi*50*i; -------i¶¼Ã»ÓÐÖµ

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2£º(m==exp(n))
  double ÐÍÅеȲ»ÄÜÓà £½£½
  Äã¿ÉÒÔÕâÑù¡£
#define pre  0.0000001

  if ( (m <exp(n)+pre)  &&  (m>exp(n)-pre ))//ÕâÑù¾ÍÊÇÏàµÈÁË£¬Èç¹ûÄ㾫¶ÈÒªÇó¸ß£¬ÔÙ°Ñpre¶¨ÒåµÄСһµã£¬

#include <stdio.h>
#include <math.h>
#define pi 3.1415926
#define pre  0.0000001
void main()
{ double i,j,m,n;
  i=1.0;
  j=pi*50.0*i;
  m=2*cos(j)*cos(j);
  n=-i/0.1128;
  for(i=0;i <100.0;i++)
  {       
if ( (m <exp(n)+pre)  &&  (m>exp(n)-pre ))
printf("i= %6.2f \n",i);
  }
}
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