diff --git a/source/bsearch.c b/source/bsearch.c
index 18a388c..daadb6e 100644
--- a/source/bsearch.c
+++ b/source/bsearch.c
@@ -39,6 +39,6 @@ int main()
 	int re;
 	scanf("%d",&re);
 	bsearch(a,n,re);
-	
+	return 0;	
 }
 
diff --git a/source/lsearch.c b/source/lsearch.c
index 941a441..22d7048 100644
--- a/source/lsearch.c
+++ b/source/lsearch.c
@@ -29,6 +29,6 @@ int main()
 	int re;
 	scanf("%d",&re);
 	lsearch(a,n,re);
-	
+	return 0;
 }
 
diff --git a/source/msearch.c b/source/msearch.c
index dba9a7e..b0a95f5 100644
--- a/source/msearch.c
+++ b/source/msearch.c
@@ -28,6 +28,6 @@ int main()
 	int re;
 	scanf("%d",&re);
 	msearch(a,n,re);
-	
+	return 0;
 }
 
diff --git a/source/queuearray.c b/source/queuearray.c
index 3c7b647..2b9f55b 100644
--- a/source/queuearray.c
+++ b/source/queuearray.c
@@ -88,5 +88,6 @@ int main()
 			default: printf("--Invalid Choice--\n");
 		}
 	}
+	return 0;
 	
 }
diff --git a/source/queuell.c b/source/queuell.c
index fe5b8b1..ea0e27d 100644
--- a/source/queuell.c
+++ b/source/queuell.c
@@ -81,5 +81,6 @@ int main()
 			default: printf("--Invalid Choice--\n");
 		}
 	}
+	return 0;
 	
 }
diff --git a/source/stackarray.c b/source/stackarray.c
index 258b20a..da40168 100644
--- a/source/stackarray.c
+++ b/source/stackarray.c
@@ -59,5 +59,5 @@ int main()
 			default: printf("--Invalid Choice--\n");
 		}
 	}
-	
+	return 0;
 }
diff --git a/source/stackll.c b/source/stackll.c
index dfa1283..94f0f59 100644
--- a/source/stackll.c
+++ b/source/stackll.c
@@ -69,5 +69,6 @@ int main()
 			default: printf("--Invalid Choice--\n");
 		}
 	}
+	return 0;
 	
 }