c语言 指针数组

#include <stdio.h>
#include <string.h>
#define DIM(a) (sizeof(a)/sizeof(*a))
int lookup_keyword(const char* key, const char* table[], const int size)
{
int ret = -1;

int i = 0;

for(i=0; i<size; i++)
{
if( strcmp(key, table[i]) == 0 )
{
ret = i;
break;
}
}

return ret;
}
int main()
{
const char* keyword[] = {
"do",
"for",
"if",
"register",
"return",
"switch",
"while",
"case",
"static"
};
printf("%d\n", lookup_keyword("return", keyword, DIM(keyword)));
printf("%d\n", lookup_keyword("main", keyword, DIM(keyword)));
return 0;
}