/****编程一些细节 ****/
#define f(x) (x)*(x)
#define Pstr char*
typedef char * Pstr_;
#include<stdio.h>
int main ()
{
int a=6,b=2;
int c=f(a)/f(b);
printf("%d ",c);
Pstr s1,s2;
Pstr_ s3,s4;
s1="china ";
s2='c';
s3="hello";
s4="world";
printf("\n %s %c %s %s",s1,s2,s3,s4);
return 0;
}
/***** result ******/
/**
36
china c hello world
**/