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void MyFun(int x);    //´Ë´¦µÄÉêÃ÷Ò²¿Éд³É£ºvoid MyFun( int );
int main(int argc, char* argv[])
{
   MyFun(10);     //ÕâÀïÊǵ÷ÓÃMyFun(10);º¯Êý
      return 0;
}
void MyFun(int x)  //ÕâÀﶨÒåÒ»¸öMyFunº¯Êý
{
   printf(“%d\n”,x);
}
    Õâ¸öMyFunº¯ÊýÊÇÒ»¸öÎÞ·µ»ØÖµµÄº¯Êý£¬Ëü²¢²»Íê³ÉʲôÊÂÇé¡£ÕâÖÖµ÷Óú¯ÊýµÄ¸ñʽÄãÓ¦¸ÃÊǺÜÊìϤµÄ°É£¡¿´Ö÷º¯ÊýÖе÷ÓÃMyFunº¯ÊýµÄÊéд¸ñʽ£º
MyFun(10);
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void (*FunP)(int) ;   //Ò²¿Éд³Évoid (*FunP)(int x);
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c= ''||c=='\t'||c=='\n'
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if((filedesc==open(argv[i],0))<0)
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atan_self(double x)
{
//atan(x)=x-x^3/3+x^5/5-x^7/7+.....(-1<x<1)
//return:[-pi/2,pi/2]
double mult,sum,xx;
sum=0;
if(x==1){
return pi/4;
}
if(x==-1){
return -pi/4;
}
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