判断C?行??境的程序

/*
**判断C?行??境的程序
*/
/*
**静?初始化
*/
int static_variable=5;
void
f()
{
 register int i1, i2, i3, i4, i5, i6, i7, i8, i9, i10;
 register char *c1, *c2, *c3, *c4, *c5, *c6, *c7 , *c8, *c9, *c10;
 extern int a_very_long_name_to_sec_how_long_they_can_be;
 double dbl;
 int func_ret_int();
 double func_ret_double();
 char *func_ret_char_ptr();
 
 /*
 **寄存器?量的最大数量
 */ 
 i1 = 1; i2 = 2; i3 = 3; i4 = 4; i5 = 5;
 i6 = 6; i7 = 7; i8 = 8; i9 = 9; i10 = 10;
 c1 = (char *)110; c2 = (char *)120;
 c3 = (char *)130; c4 = (char *)140;
 c5 = (char *)150; c6 = (char *)160;
 c7 = (char *)170; c8 = (char *)180;
 c9 = (char *)190; c10 = (char *)200;
 
 /*
 **外部名字
 */
 a_very_long_name_to_sec_how_long_they_can_be = 1;
 
 /*
 **函数?用/返回??,堆??(?程活???)
 */
 i2 = func_ret_int(10,i1,i10);
 dbl = func_ret_double();
 c1 = func_ret_char_ptr(c1);
}
int
func_ret_int(int a, int b, register int c)
{
 int d;
 
 d = b - 6;
 return a + b + c; 
}
double
func_ret_double()
{
 return 3.14; 
}
char *
func_ret_char_ptr(char *cp)
{
 return cp + 1; 
}