fix #1 and add tests

nefe · Oct 15, 2017 · ec01337 · ec01337
1 parent 0b99f54
commit ec01337
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Showing 2 changed files with 13 additions and 12 deletions.
diff --git a/src/index.js b/src/index.js
@@ -22,12 +22,23 @@ function digitLength(num) {
   return len > 0 ? len : 0;
 }
 
+/**
+ * 精确乘法
+ */
+function times(num1, num2) {
+  const num1Changed = Number(num1.toString().replace('.', ''));
+  const num2Changed = Number(num2.toString().replace('.', ''));
+  const baseNum = digitLength(num1) + digitLength(num2);
+  return num1Changed * num2Changed / Math.pow(10, baseNum);
+}
+
+
 /**
  * 精确加法
  */
 function plus(num1, num2) {
   const baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
-  return (num1 * baseNum + num2 * baseNum) / baseNum;
+  return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
 }
 
 /**
@@ -38,16 +49,6 @@ function minus(num1, num2) {
   return (num1 * baseNum - num2 * baseNum) / baseNum;
 }
 
-/**
- * 精确乘法
- */
-function times(num1, num2) {
-  const num1Changed = Number(num1.toString().replace('.', ''));
-  const num2Changed = Number(num2.toString().replace('.', ''));
-  const baseNum = digitLength(num1) + digitLength(num2);
-  return num1Changed * num2Changed / Math.pow(10, baseNum);
-}
-
 /**
  * 精确除法
  */

diff --git a/test/test.spec.js b/test/test.spec.js
@@ -44,7 +44,7 @@ describe('NP.plus', () => {
     check(-3, 7, 4);
     check(-221, 38, -183);
     check(-1, 0, -1);
-
+    check(2.018, 0.001, 2.019);
     check(1.3224e10, 1.3224e3, 13224001322.4);
   });
 });