73 lines
2.5 KiB
C#
73 lines
2.5 KiB
C#
namespace Lesson23_面向对象相关_String练习
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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Console.WriteLine("string练习题");
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#region 练习题一
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//请写出string中提供的截取和替换对应的函数名
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string str = "123";
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str = str.Substring(1);
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str = str.Substring(1, 1);
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str = "123123";
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str = str.Replace("123", "哈哈哈");
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#endregion
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#region 练习题二
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string str1 = "1|2|3|4|5|6|7";
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string[] strs = str1.Split('|');
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str1 = "";
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for (int i = 0; i < strs.Length; i++)
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{
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str1 += int.Parse(strs[i]) + 1;
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if(i < strs.Length - 1)
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{
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str1 += "|";
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}
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}
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Console.WriteLine(str1);
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#endregion
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#region 练习题四
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string strr = null;//开了栈内存1，没开堆内存0
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strr = "123";//堆内存+1
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string str2 = strr;//栈内存+1
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str2 = "321";//堆内存+1
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str2 += "123";//堆内存+1
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// 请问，上面这段代码，分配了多少个新的堆空间
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//3个
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#endregion
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#region 练习题五
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//编写一个函数，将输入的字符串反转。不要使用中间商，你必须原地修改输入数组。交换过程中不使用额外空间
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//比如：输入{'h','e','l','l','o'}
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//输出 {'o','l','l','e','h'}
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Console.WriteLine("请输入内容");
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string str3 = Console.ReadLine();
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char[] chars = str3.ToCharArray();
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for (int i = 0; i < chars.Length / 2; i++)
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{
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//交换
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//char temp = chars[i];
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//chars[i] = chars[chars.Length - 1 - i];
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//chars[chars.Length - 1 - i] = temp;
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chars[i] = (char)(chars[i] + chars[chars.Length - 1 - i]);
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chars[chars.Length - 1 - i] = (char)(chars[i] - chars[chars.Length - 1 - i]);
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chars[i] = (char)(chars[i] - chars[chars.Length - 1 - i]);
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}
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for (int i = 0; i < chars.Length; i++)
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{
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Console.Write(chars[i]);
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}
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str3 = new string(chars);
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Console.WriteLine(str3);
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#endregion
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}
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}
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}
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