[英]Code is working unexpectedly in c# using visual studio code
我是 c# 的初学者,我想创建一个简单的计算器。 我已经编写了所有代码,它没有显示任何错误,但是,它没有正确显示。 这是我正在使用的所有代码:
using System;
namespace C_
{
class Program
{
static void Main(string[] args)
{
Console.Title = "Calculator";
float num1;
float num2;
float resultSum;
float resultSub;
float resultProd;
float resultDiv;
Console.Write("Enter your first number ");
num1 = Convert.ToInt32(Console.Read());
num2 = Convert.ToInt32(Console.Read());
resultSum = num1 + num2;
Console.Write("The sum is " + resultSum);
resultSub = num1 - num2;
Console.Write("The differnce is " + resultSub);
resultProd = num1 * num2;
Console.Write("The product is " + resultProd);
resultDiv = num1 / num2;
Console.Write("The quotient is " + resultDiv);
Console.ReadKey();
}
}
}
当我在没有调试的情况下运行它时,控制台显示:
https://docs.microsoft.com/en-us/dotnet/api/system.console.writeline?view=netcore-3.1
如果将Console.Write...
替换为Console.WriteLine...
,它将在打印语句的末尾添加换行符,因此您的输出应如下所示:
The sum is 63
The difference is 37
...
您的代码使用控制台键值,而不是您输入的数值。 2的consolekey是50,return的consolekey是13。
不确定我是否会使用float
作为类型。 特别是因为您要转换为int32
。 我在你的程序中加入了一些不同的技术。 因为你只是在学习这些是很好的事情要知道。 我在代码的注释中提供了解释。
static void Main(string[] args)
{
Console.Title = "Calculator";
// No need to put the type multiple times
// Just use a comma to separate the names
int num1, num2, resultSum, resultSub, resultProd, resultDiv;
Console.WriteLine("Enter your first number:");
// This is just a label
Num1Entry:
try
{
num1 = Convert.ToInt32(Console.ReadLine());
}
// This exception is for when you don't get a number from the user. i.e. num1 = a
catch (FormatException)
{
Console.WriteLine("Not a number. Please enter a valid number.");
// This will jump your program back to the beginning of the try-catch so you can enter a valid number for num1
goto Num1Entry;
}
// This exception is for when the number is out of range for the data type. i.e. num1 = 2147483648 is too big for an int data type.
catch (OverflowException)
{
Console.WriteLine("Invalid number. Please enter a valid number.");
// This will jump your program back to the beginning of the try-catch so you can enter a valid number for num1
goto Num1Entry;
}
Console.WriteLine("Enter your second number:");
// This is just a label
Num2Entry:
try
{
num2 = Convert.ToInt32(Console.ReadLine());
}
// This exception is for when you don't get a number from the user. i.e. num2 = a
catch (FormatException)
{
Console.WriteLine("Not a number. Please enter a valid number.");
// This will jump your program back to the beginning of the try-catch so you can enter a valid number for num2
goto Num2Entry;
}
// This exception is for when the number is out of range for the data type. i.e. num2 = 2147483648 is too big for an int data type.
catch (OverflowException)
{
Console.WriteLine("Invalid number. Please enter a valid number.");
// This will jump your program back to the beginning of the try-catch so you can enter a valid number for num2
goto Num2Entry;
}
resultSum = num1 + num2;
Console.WriteLine("The sum is " + resultSum);
resultSub = num1 - num2;
Console.WriteLine("The differnce is " + resultSub);
resultProd = num1 * num2;
Console.WriteLine("The product is " + resultProd);
// if num2 = 0 you will get an exception.
// Use a try-catch to keep your program from failing.
try
{
resultDiv = num1 / num2;
Console.WriteLine("The quotient is " + resultDiv);
}
catch (DivideByZeroException)
{
Console.WriteLine("You cannot divide by 0");
}
Console.ReadKey();
}
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