A small demo on using C macros

result.c

# 1 "symtab_demo.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 1 "<command-line>" 2
# 1 "symtab_demo.c"






static symtab symbol_table[] = {
    {"add", fn_add},
    {"print", fn_print},
    {"sub", fn_sub},
    {NULL, NULL}
};

tiny_symtab.c

/* This is a fairly useful feature to know if
   you are writing anything more complicated in C.
   Run gcc -E tiny_symtab.c to get the result.
 */

#define ENTRY(a) {#a, fn_##a}

static symtab symbol_table[] = {
    ENTRY(add),
    ENTRY(print),
    ENTRY(sub),
    {NULL, NULL}
};