Question

c# 查询字符串内有多少个指定字符!

Answer 1

C#计算字符串中有多少个“a”using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { Console.WriteLine("这是个计算字符串中含有多少/"a/"的程序"); Console.WriteLine("请输入字符串"); string s1 = Console.ReadLine(); //int x = s1.IndexOf("a"); int count = 0; int startIndex = 0; while (true) { int y = s1.IndexOf("a", startIndex); if (y != -1) { count++; startIndex = y + 1; } else { break; } } Console.WriteLine("/"a/"在字符串中出现了{0}次", count); Console.ReadLine(); } } } first:using System.Text;