實作按下 0 後怎麼處理

2020-05-06 06:24:51 +08:00
parent 4f81fc3445
commit e7f861c77d
1 changed files with 10 additions and 0 deletions
--- a/AndroidCalculator/Calculator.swift
+++ b/AndroidCalculator/Calculator.swift
@@ -27,6 +27,16 @@ class Calculator {
    case "AC":
      // 清空到剩下 0
      formula = ["0"]
+      
+    case "0":
+      if formula.last == "0" {
+        return
+      } else if ["+", "-", "×", "÷"].firstIndex(of: formula.last!) != nil {
+        formula.append(text)
+      } else {
+        formula.append(formula.popLast()! + text)
+      }
+      
    default:
      formula.append(text)
    }