Non-whole number calculations

# Problem Description

Some calculations of two whole numbers may result in a decimal, such as division.

# Desired Behavior

When dividing two numbers, produce a result as a decimal number, such as `5/2` should produce `2.5` rather than `2`

在專案中尋找計算或除法邏輯，並重現回報的 5/2 案例。更新相關行為，使整數相除時保留小數結果，然後驗證 5/2 會產生 2.5，並確認現有的計算行為仍可正常運作。

由索引模型根據 Issue 內容生成。