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Codex edited this page Oct 11, 2026 · 2 revisions

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算術

使用手冊C# · 實用指南

計算和、差、乘積、商數和餘數。整數除法丟棄小數部分;一元 +/- 設定符號。

簡單範例 (Example.cs)

請將此範例另存為 Example.cs,並與本頁其他範例分開執行。

Example.cs:

// PROJECT-EXAMPLE
System.Console.WriteLine(7 / 2);
double quotient = 7.0 / 2;
System.Console.WriteLine(quotient.ToString(System.Globalization.CultureInfo.InvariantCulture));

結果:

3
3.5

句法

left + right / left % right / -value

範例1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        int left = 17, right = 5;
        Console.WriteLine($"{left + right}:{left - right}:{left * right}:{left / right}:{left % right}");
    }
}

範例2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        double value = 17.0 / 5.0;
        Console.WriteLine($"{+value}:{-value}:{Math.Round(value, 2)}");
    }
}

官方來源:Microsoft學習。

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