修改公式和计算帮助类

yzg-util-base/src/main/java/com/yanzuoguang/util/helper/FormulaHelper.java

@@ -52,7 +52,7 @@ public class FormulaHelper {
         // 从名称转换列序号
         int formulaColumnIndex = 0;
         char[] chs = new char[columnName.length()];
-        columnName.getChars(0, columnName.length() , chs, 0);
+        columnName.getChars(0, columnName.length(), chs, 0);
         for (int i = 0; i < chs.length; i++) {
             formulaColumnIndex = formulaColumnIndex * 26 + (chs[i] - 'a' + 1);
         }
@@ -216,13 +216,13 @@ public class FormulaHelper {
     private double calcItem(String flag, double a, double b) {
         switch (flag) {
             case "+":
-                return a + b;
+                return CalcHelper.add(a, b);
             case "-":
-                return a - b;
+                return CalcHelper.sub(a, b);
             case "*":
-                return a * b;
+                return CalcHelper.mul(a, b);
             case "/":
-                return a / b;
+                return CalcHelper.div(a, b);
             default:
                 return 0;
         }