diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b0c271a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -std=c99
+dIRS = a1 du1 du2 du3 du4
+all: 
+	@for %%d in ($(dIRS)) do \
+		$(CC) $(CFLAGS) %%d\program.c -o %%d\program.exe
+clean:
+	@for %%d in ($(dIRS)) do \
+		if exist %%d\program.exe del %%d\program.exe
+build-%:
+	$(CC) $(CFLAGS) $*/program.c -o $*/program.exe
diff --git a/a1/program.c b/a1/program.c
index 817918d..ac1d84d 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -20,4 +20,4 @@ int main() {
     }
     printf("\nLines count: %d\n", c2);
     return 0;
-}
+}
\ No newline at end of file
diff --git a/a1/program.exe b/a1/program.exe
index 2437b24..332f2cf 100644
Binary files a/a1/program.exe and b/a1/program.exe differ
diff --git a/du1/output/program.exe b/du1/output/program.exe
deleted file mode 100644
index cc00020..0000000
Binary files a/du1/output/program.exe and /dev/null differ
diff --git a/du1/program.exe b/du1/program.exe
index f57d482..0005b45 100644
Binary files a/du1/program.exe and b/du1/program.exe differ
diff --git a/du2/program.exe b/du2/program.exe
index 26e1d77..bf1103b 100644
Binary files a/du2/program.exe and b/du2/program.exe differ
diff --git a/du3/output/program.exe b/du3/output/program.exe
deleted file mode 100644
index d79a4cd..0000000
Binary files a/du3/output/program.exe and /dev/null differ
diff --git a/du3/program.c b/du3/program.c
index bfa8cbe..d2333e2 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -38,13 +38,14 @@ int main() {
     case '/':
             if (cislo2 == 0) {
                 printf("ZLE\n");
-                continue;;
+                continue;
             } 
                 result2 = cislo1 / cislo2;
                 break;
             default:
                 printf("CHYBA\n");
-                continue;;
+                continue;
+                
         }
 
 
@@ -58,4 +59,6 @@ int main() {
     }    
     
     return 0;
-    }
\ No newline at end of file
+    }
+
+    
\ No newline at end of file
diff --git a/du3/program.exe b/du3/program.exe
index 4381162..27372b8 100644
Binary files a/du3/program.exe and b/du3/program.exe differ
diff --git a/du4/output/program.exe b/du4/output/program.exe
deleted file mode 100644
index 7d9d48a..0000000
Binary files a/du4/output/program.exe and /dev/null differ
diff --git a/du4/program.exe b/du4/program.exe
new file mode 100644
index 0000000..a72136e
Binary files /dev/null and b/du4/program.exe differ