检索出一个字符串中某字符第n次出现的位置代码,CSharp代码库,德仔网

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【CSharp】检索出一个字符串中某字符第n次出现的位置

作者:Duncan / 发布于2014/11/18/ 472


	class Program
	 {
	 static void Main(string[] args)
	 {
	 Console.WriteLine("Please input your STRING:");
	 string a = Console.ReadLine();
	 char c;
	 char find_c;
	 Console.WriteLine("Please input the CHARACTER in your string:");
	 find_c = Convert.ToChar(Console.ReadLine());
	 int count = 0;
	 for (int i = 0; i < a.Length; i++)
	 {
	 c = a[i];
	 if (c == find_c)//求得a中包含该字符的个数，以便遍历
	 {
	 count++;
	 }
	 }
	 Console.WriteLine("There are total {0} of char '{1}' in your input string.",count,find_c);
	 int index = 0;
	 int n;//第n个find_c
	 Console.WriteLine("Please input the SEQUENCE of the char '{0}' in your input string:", find_c);
	 n = Convert.ToInt32(Console.ReadLine());
	 if (n > count)
	 {
	 Console.WriteLine("Error:The Num must be less than or equal to {0}.",count);
	 Console.ReadKey();
	 return;
	 }
	 for (int j = 1; j <= count; j++)
	 {
	 index = a.IndexOf(find_c,index);
	 if (j == n)
	 {
	 break;
	 }
	 else
	 {
	 index = a.IndexOf(find_c,index+1);
	 }

	 }
	 Console.WriteLine("The Index of the No.{0} char '{1}' in your input string is {2}.", n, find_c, index);
	 Console.ReadKey();
	 }
	 }

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