--- a/progs/C4.c	Tue Oct 07 00:26:40 2014 +0100
+++ b/progs/C4.c	Tue Oct 07 00:52:18 2014 +0100
@@ -5,9 +5,9 @@
 // on the command line
 
 
-main(int argc, char **argv)
+int main(int argc, char **argv)
 {
-        char *string = "This is a secret string\n";
+   char *string = "This is a secret string\n";
 
-        printf(argv[1]);
+   printf(argv[1]);
 }