#define

#include<stdio.h>
/* important #define doesnt alocate anything on the Memory, const also do that: const int i = 10;  */
#define num 10 // as int
#define ch 'z' // as a char
#define moo 10.2 // as float or double.
int main()
{
    printf("%c\n",ch);
    printf("%d\n",num);
    printf("%2.1f\n",moo);

    return 0;
}