Bugfix & Makefile

Makefile

@@ -0,0 +1,8 @@
+files = add div mean mul sub sum
+
+all: $(files)
+
+$(files): %: %.c
+
+clean:
+	rm -v $(files) 

add.c

@@ -13,10 +13,10 @@ int main(int argc, char **argv) {
   e1 = sscanf(argv[1], "%i", &v1);
   e2 = sscanf(argv[2], "%i", &v2);
   if(e1==EOF) {
-    eprintf("%s: argument %d cannot be parsed as int", *argv);
+    eprintf("%s: argument 1 cannot be parsed as int", *argv);
     return 1;
   } else if(e2==EOF) {
-        eprintf("%s: argument %d cannot be parsed as int", *argv);
+        eprintf("%s: argument 2 cannot be parsed as int", *argv);
     return 1;
   }
   out=v1+v2;

div.c

@@ -13,10 +13,10 @@ int main(int argc, char **argv) {
   e1 = sscanf(argv[1], "%i", &v1);
   e2 = sscanf(argv[2], "%i", &v2);
   if(e1==EOF) {
-    eprintf("%s: argument %d cannot be parsed as int", *argv);
+    eprintf("%s: argument 1 cannot be parsed as int", *argv);
     return 1;
   } else if(e2==EOF) {
-        eprintf("%s: argument %d cannot be parsed as int", *argv);
+        eprintf("%s: argument 2 cannot be parsed as int", *argv);
     return 1;
   }
   out=v1/v2;

mul.c

@@ -13,10 +13,10 @@ int main(int argc, char **argv) {
   e1 = sscanf(argv[1], "%i", &v1);
   e2 = sscanf(argv[2], "%i", &v2);
   if(e1==EOF) {
-    eprintf("%s: argument %d cannot be parsed as int", *argv);
+    eprintf("%s: argument 1 cannot be parsed as int", *argv);
     return 1;
   } else if(e2==EOF) {
-        eprintf("%s: argument %d cannot be parsed as int", *argv);
+        eprintf("%s: argument 2 cannot be parsed as int", *argv);
     return 1;
   }
   out=v1*v2;

sub.c

@@ -13,10 +13,10 @@ int main(int argc, char **argv) {
   e1 = sscanf(argv[1], "%i", &v1);
   e2 = sscanf(argv[2], "%i", &v2);
   if(e1==EOF) {
-    eprintf("%s: argument %d cannot be parsed as int", *argv);
+    eprintf("%s: argument 1 cannot be parsed as int", *argv);
     return 1;
   } else if(e2==EOF) {
-        eprintf("%s: argument %d cannot be parsed as int", *argv);
+        eprintf("%s: argument 2 cannot be parsed as int", *argv);
     return 1;
   }
   out=v1-v2;