1.do  while  语句            2.  while  语句               

main( )                                 main( )

{  long  i,s;                           {  long  i,s;

  i=1;  s=1;                              i=1;  s=1;

  do                                       while(i<=8)

{   s*=i;                                   {   s*=i;

  i++;                                          i++;

}while(i<=8);                             }

  printf("%ld\n",s);                   printf("%ld\n",s); 

}                                              }

3.for语句

main( )

{  long  i,s;

for(i=1,s=1;i<=8;i++)

   s*=i;

printf("%ld\n",s); 

}