test.c

#include <stdio.h>
#include <time.h>

enum {
    MAX  = 10, 
};

typedef struct Nameval Nameval;
struct Nameval {
    char *name;
    int  value;
};

void main(){
    Nameval htmlchars[] = {
        "AEIig"  , 0x00c6, 
        "Aacute" , 0x00c1, 
        "Acirc"  , 0x00c2, 
        "zeta"   , 0x03b6, 
    };
    Nameval *p1, *p2;
    printf("sizeof int: %d\n",sizeof(int));
    printf("sizeof long: %d\n",sizeof(long));
    printf("sizeof char*: %d\n",sizeof(char*));
    printf("sizeof Nameval: %d\n",sizeof(Nameval));
    printf("%p\n", p1 = &htmlchars[0]); // 
    printf("%p\n", p2 = &htmlchars[2]);
    printf("%d\n", p2 - p1);
    printf("%d\n", (void*)p2 - (void*)p1);
    printf("%d\n", (long*)p2 - (long*)p1);
}

int is_odd_number(int n) {
    printf("%f: %f \n", (float) n, (float) (n % 2));
}

#define NELEMS(array) (sizeof(array) / sizeof(array[0]))