Added a few error messages for wrong inputs

1 files changed, 6 insertions, 3 deletions

diff --git a/src/main.c b/src/main.c
index 2d0fdf7..14c6c49 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,18 +1,21 @@
 #include "cycle_detection.h"
 
 #include <stdio.h>
-#include <stdlib.h>
 
 int main(int argc, char **argv) {
     if(argc < 2) {
         printf("Missing argument: input file\n");
         printf("Usage:\n");
-        printf("%s <filename>\n", argv[0]);
+        printf(" %s <filename>\n", argv[0]);
         return 1;
     }
 
     Graph *g = graph_read(argv[1]);
-    if(!g) return 2;
+    if (!g) {
+        printf("%s: %s: No such file\n", argv[0], argv[1]);
+        return 2;
+    }
+
     cycle_detection(g);
     graph_delete(g);
     return 0;