EN CSharp Keyword long

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C#: long

Handbook C# · Practical Guide

A signed 64-bit integer.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
long amount = 12L;
System.Console.WriteLine(amount + 2);

Result:

14

Syntax

long value = 120L;

The type of the variable determines the range and rules of arithmetic. To check the overflow of integers, use checked; for text conversion — TryParse.

Example 1: simple form

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)
    {
        long first = 120L;
        long second = 2;
        Console.WriteLine(first + second);
    }
}

Example 2: another practical form

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)
    {
        long[] values = [120L, 2, 3];
        foreach (long value in values) Console.WriteLine(value);
        Console.WriteLine(long.MaxValue);
    }
}

Official source: Microsoft Learn.