doc: add comment for dtoa.c.

zhuizhuhaomeng · zhuizhuhaomeng · commit b0b4c58df8fb · 2024-08-01T09:23:44.000+08:00
diff --git a/dtoa.c b/dtoa.c
@@ -1,3 +1,7 @@
+/* The code comes from https://portal.ampl.com/~dmg/netlib/fp/dtoa.c
+ * Go to https://portal.ampl.com/~dmg/netlib/fp/changes for the detailed changes.
+ */
+
 /****************************************************************
  *
  * The author of this software is David M. Gay.

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,7 @@`
	`1`	`+/* The code comes from https://portal.ampl.com/~dmg/netlib/fp/dtoa.c`
	`2`	`+ * Go to https://portal.ampl.com/~dmg/netlib/fp/changes for the detailed changes.`
	`3`	`+ */`
	`4`	`+`
`1`	`5`	`/****************************************************************`
`2`	`6`	`*`
`3`	`7`	`* The author of this software is David M. Gay.`