#include<stdio.h>
#define STRING(x) #x

int main()
{
    printf("%s\n",STRING(Hello World));
    printf("%s\n",STRING(100));
    printf("%s\n",STRING(while));
    printf("%s\n",STRING(return));

    return 0;
}

#include<stdio.h>
#define CALL(f,p) (printf("Call function %s\n",#f),f(p))

int square(int n)
{
    return n*n;
}

int func(int x)
{
    return x;
}

int main()
{
    int result = 0;
    result = CALL(square,4);
    printf("result = %d\n",result);
    result = CALL(func,10);
    printf("result = %d\n",result);
    return 0;
}

#include<stdio.h>
#define NAME(n) name##n

int main()
{
    int NAME(1);
    int NAME(2);
    
    NAME(1);
    NAME(2);

    printf("%d\n",NAME(1));
    printf("%d\n",NAME(2));

    return 0;
}

#include<stdio.h>

#define STRUCT(type) typedef struct _tag_##type type;\
    struct _tag_##type
STRUCT(Student)
{
    char* name;
    int id;
};

int main()
{
    Student s1;
    Student s2;

    s1.name = "s1";
    s1.id = 0;

    s2.name = "s2";
    s2.id = 1;

    printf("s1.name = %s\n",s1.name);
    printf("s1.id = %d\n",s1.id);
    printf("s2.name = %s\n",s2.name);
    printf("s2.id = %d\n",s2.id);
    return 0;
}