diff --git a/factorial.c b/factorial.c
new file mode 100644
index 0000000..fca3de8
--- /dev/null
+++ b/factorial.c
@@ -0,0 +1,13 @@
+#include<stdio.h>
+int main()
+{
+int i,n;
+long f;
+printf("\nEnter a number whose factorial is to be calculated:");
+scanf("%d",&n);
+for(i=n;i>=1;i--)
+{f*=i;}
+printf("\nThe factorial is %ld",f);
+return 0;
+}
+
diff --git a/hello_world.cpp b/hello_world.cpp
deleted file mode 100644
index 91bd83b..0000000
--- a/hello_world.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#include<stdio.h)
-
-int main()
-{
-printf("Hello World "),
-}
-