int numberInput = Int32.Parse(Console.ReadLine()); int sum = numberInput + 20; Console.WriteLine(sum); 有问题吗
时间: 2024-03-04 18:53:31 浏览: 18
这段代码可能会在以下情况下出现异常:
1. 用户输入的不是整数。如果用户在控制台中输入的字符串不能转换为整数,将会抛出 `FormatException` 异常。
2. 用户输入的整数超出了 `Int32` 类型的范围。如果用户输入的整数超出了 `Int32` 类型的最大值或最小值,将会抛出 `OverflowException` 异常。
因此,在使用这段代码时,需要注意处理这两种异常情况,例如使用 `try-catch` 语句来捕捉异常并进行相应的处理。
相关问题
int numberInput = Int32.Parse(Console.ReadLine()); int sum = numberInput + 20; Console.WriteLine(sum); 问题
这段代码的作用是读取用户从控制台输入的整数,然后将这个整数加上 20,并把结果输出到控制台。
具体解释如下:
1. `Int32.Parse(Console.ReadLine())`:该代码从控制台读取一个字符串,然后将其转换为整数类型。如果用户输入的字符串不能转换为整数,会抛出异常。这里假设用户输入的是一个有效的整数。
2. `int sum = numberInput + 20;`:该代码将输入的整数加上 20,并将结果保存在 `sum` 变量中。
3. `Console.WriteLine(sum);`:该代码将 `sum` 变量的值输出到控制台。
因此,如果用户在控制台中输入了一个整数,程序将会把这个整数加上 20,并输出结果。例如,如果用户输入的是 5,则程序会输出 25。
Console.WriteLine("Please enter a number:"); int number = int.Parse(Console.ReadLine()); while (number <= 0) { Console.WriteLine("Sorry,please enter a positive value."); number = Int32.Parse(Console.ReadLine()); } Console.WriteLine("Please enter " + number + " words:"); string[] words = new string[number]; for (int n = 0; n < number; n++) { Console.WriteLine($"Please enter word {n + 1}"); string word = Console.ReadLine(); while (word.Length < 1) { Console.WriteLine("Sorry,your word must have at least one character"); word = Console.ReadLine(); } words[n] = word; } Console.WriteLine("You enter these words:"); foreach (string s in words) { Console.WriteLine(s); }; Console.WriteLine("Please enter a character:"); char letter = char.Parse(Console.ReadLine()); if (char.IsLetter(letter)) { string joinedWords = string.Join("", words).ToLower(); int count = 0; for (int i = 0; i < joinedWords.Length; i++) { if (joinedWords[i] == letter) { count++; } } if (count == 0) { Console.WriteLine("The letter you entered does not appear"); } else { double per = Convert.ToDouble(count) / Convert.ToDouble(joinedWords.Length); if (per > 0.25) { Console.WriteLine("The letter " + letter + " appears " + count + " times in the array. This letter makes up more than 25 % of the total number of characters."); } else { Console.WriteLine("The letter " + letter + " appears " + count + " times in the array. This letter makes up less than 25 % of the total number of characters."); } } } else { Console.WriteLine("Incorrect letter format entered,Please enter again:"); letter = char.Parse(Console.ReadLine()); } 改进代码
以下是改进后的代码,主要是加入了异常处理和代码重构:
```csharp
using System;
namespace ConsoleApp
{
class Program
{
static void Main(string[] args)
{
int number = ReadPositiveInt("Please enter a number:");
string[] words = new string[number];
for (int n = 0; n < number; n++)
{
words[n] = ReadNonEmptyString($"Please enter word {n + 1}:");
}
Console.WriteLine("You entered these words:");
foreach (string word in words)
{
Console.WriteLine(word);
}
char letter = ReadLetter("Please enter a character:");
string joinedWords = string.Join("", words).ToLower();
int count = CountLetter(letter, joinedWords);
if (count == 0)
{
Console.WriteLine($"The letter {letter} does not appear");
}
else
{
double per = Convert.ToDouble(count) / Convert.ToDouble(joinedWords.Length);
if (per > 0.25)
{
Console.WriteLine($"The letter {letter} appears {count} times in the array. This letter makes up more than 25% of the total number of characters.");
}
else
{
Console.WriteLine($"The letter {letter} appears {count} times in the array. This letter makes up less than 25% of the total number of characters.");
}
}
}
static int ReadPositiveInt(string message)
{
int number;
while (true)
{
try
{
Console.WriteLine(message);
number = int.Parse(Console.ReadLine());
if (number > 0)
{
return number;
}
else
{
Console.WriteLine("Sorry, please enter a positive value.");
}
}
catch (FormatException)
{
Console.WriteLine("Invalid input format, please enter an integer.");
}
}
}
static string ReadNonEmptyString(string message)
{
string word;
while (true)
{
Console.WriteLine(message);
word = Console.ReadLine();
if (!string.IsNullOrEmpty(word))
{
return word;
}
else
{
Console.WriteLine("Sorry, your word must have at least one character.");
}
}
}
static char ReadLetter(string message)
{
char letter;
while (true)
{
try
{
Console.WriteLine(message);
letter = char.Parse(Console.ReadLine());
if (char.IsLetter(letter))
{
return letter;
}
else
{
Console.WriteLine("Incorrect letter format entered, please enter again:");
}
}
catch (FormatException)
{
Console.WriteLine("Invalid input format, please enter a letter.");
}
}
}
static int CountLetter(char letter, string word)
{
int count = 0;
foreach (char c in word)
{
if (c == letter)
{
count++;
}
}
return count;
}
}
}
```
改进后的代码加入了异常处理,可以更好地处理输入错误的情况。同时,代码也进行了重构,使得逻辑更加清晰,可读性更高。