ADD: distance and argv usage

src/distance.c

@@ -20,9 +20,7 @@ double distance_euclid_int(const vector_int_t* p1, const vector_int_t* p2) {
 	return sqrt((double) acc);
 }
 
-inline int_t
-
-abs_diff(const int_t a1, const int_t a2) {
+int_t abs_diff(const int_t a1, const int_t a2) {
 	int_t diff = a2 - a1;
 	return diff >= 0 ? diff : -diff;
 }
@@ -39,5 +37,12 @@ double distance_manhattan_int(const vector_int_t* p1, const vector_int_t* p2) {
 }
 
 double distance_chebyshev_int(const vector_int_t* p1, const vector_int_t* p2) {
-	return ERROR;
+	if (p1->dim != p2->dim)return ERROR;
+	int_t max = ERROR;
+	int_t item;
+	for (size_t i = 0; i < p1->dim; ++i) {
+		item = abs_diff(p1->data[i], p2->data[i]);
+		if (item > max) max = item;
+	}
+	return (double) max;
 }

src/main.c

+#include <stdio.h>
 #include <stdlib.h>
 
 
-int main(int argc, char **argv) {
+int main(int argc, char** argv) {
+	fprintf(stderr, "USAGE:    %s  <INPUT_FILE>  <OUTPUT_FILE>\n", argv[0]);
+	char* ipath = "/dev/stdin";
+	char* opath = "/dev/stdout";
+	if (argc > 1) ipath = argv[1];
+	if (argc > 2) opath = argv[2];
+	// TODO
 	return EXIT_SUCCESS;
 }