Console.Read（）和Console.ReadLine（）FormatException

问题描述

 使用系统; 
 
命名空间ConsoleApplication1 
 {
类程序
 {
 static void Main（string [] args）
 {
 Int32 a = 3; 
 Int32 b = 5; 
 
 a = Console.Read（）; 
 
 b = Convert.ToInt32（Console.ReadLine（））; 
 
 Int32 a_plus_b = a + b; 
 Console.WriteLine（a + b =+ a_plus_b.ToString（））; 
} 
} 
} 
  

ReadLine（）函数：

div>

我想这只是因为在输入第一个数字后按ENTER键。。
让我们分析你的代码。您的代码读取您输入的变量 Read（）的第一个符号。但是当你按下回车键 ReadLine（）函数返回空字符串，并且格式不正确将其转换为整数。

我建议你使用 ReadLine（）函数来读取这两个变量。因此输入应该是 7-> [enter] - > 5-> [enter] 。然后你得到 a + b = 12 作为结果。

  Main（string [] args）
 {
 Int32 a = 3; 
 Int32 b = 5; 
 
 a = Convert.ToInt32（Console.ReadLine（））; 
 b = Convert.ToInt32（Console.ReadLine（））; 
 
 Int32 a_plus_b = a + b; 
 Console.WriteLine（a + b =+ a_plus_b.ToString（））; 
} 
  

using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Int32 a = 3;
            Int32 b = 5;

            a = Console.Read();

            b = Convert.ToInt32(Console.ReadLine());

            Int32 a_plus_b = a + b;
            Console.WriteLine("a + b =" + a_plus_b.ToString());
        }
    }
}

I get an error message at the ReadLine() function:

What is the problem?

解决方案

I guess it is just because you pressing ENTER key after you type first number.Lets analyze your code. Your code reads the first symbol you entered to a variable that Read() function does. But when you press enter key ReadLine() function returns empty string and it is not correct format to convert it to integer.

I suggest you to use ReadLine() function to read both variables. So input should be 7->[enter]->5->[enter]. Then you get a + b = 12 as result.

static void Main(string[] args)
{
    Int32 a = 3;
    Int32 b = 5;

    a = Convert.ToInt32(Console.ReadLine());
    b = Convert.ToInt32(Console.ReadLine());

    Int32 a_plus_b = a + b;
    Console.WriteLine("a + b =" + a_plus_b.ToString());
}

这篇关于Console.Read（）和Console.ReadLine（）FormatException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！