C# 程序读取字符串并求所有数字的总和

给定一个字符串，我们的任务是首先从用户那里读取这个字符串，然后找到给定字符串中所有数字的总和。

例子

Input : abc23d4
Output: 9

Input : 2a3hd5j
Output: 10

方法：

To reada String and find the sum of all digits present in the string follow the following steps:

• First of all we read the string from the user using Console.ReadLine() method.
• Initialize a integer sum with value 0.
• Now iterate the string till the end.
• If the character value is greater than or equal to ‘0’ and less than or equal to ‘9’ (i.e. ascii value between 48 to 57) then perform character – ‘0’  (this gives value of character) and add the value to the sum.
• Now the sum contains the value of sum of all the digits in the strings.

例子：

C#

// C# program to read the string from the user and
// then find the sum of all digits in the string
using System;
  
class GFG{
      
public static void Main()
{
    string str;
    Console.WriteLine("Enter a string ");
    
    // Reading the string from user.
    str = Console.ReadLine();
    int count, sum = 0;
    int n = str.Length;
      
    for(count = 0; count < n; count++)
    {
          
        // Checking if the string contains digits or not
        // If yes then add the numbers to find their sum 
        if ((str[count] >= '0') && (str[count] <= '9'))
        {
            sum += (str[count] - '0');
        }
    }
    Console.WriteLine("Sum = " + sum);
}
}

输出 1：

Enter a string
abc23d4
Sum = 9

输出 2：

Enter a string
2a3hd5j
Sum = 10

解释：在上面的例子中， 首先我们读取字符串，我们将迭代每个字符并通过比较字符的 ASCII 值来检查字符是否为整数。如果字符是整数，则将该值添加到总和中。在迭代结束时， sum 变量将具有字符串中数字的总和。