C# |字符串运算符
字符串是一个字符数组。 字符串类 将文本表示为一系列 Unicode 字符，并在中定义。NET 基类库。String 类的主要用途是提供属性、运算符和方法，这样使用字符串就变得容易了。 字符串类中存在两种类型的运算符:
- 等式(字符串，字符串)运算符
- 不等式(字符串，字符串)运算符
等式(字符串，字符串)运算符
该运算符用于检查给定的字符串是否包含相同的值。如果两个字符串相等，则返回 true。否则，返回 false。 语法:
public static bool operator == ( string x, string y );
参数:
字符串 x: 字符串 x 是要比较的第一个字符串。 字符串 y: 字符串 y 是第二个要比较的字符串。
返回值:该运算符的返回类型为系统。布尔。如果字符串 x 等于字符串 y ，则返回真，否则返回假。 例 1:
c sharp . c sharp . c sharp . c sharp
// C# program to illustrate the
// Equality operator
using System;
class GFG {
// Main Method
public static void Main(string[] args)
{
// variables
string s1 = "WelcomeToGeeks";
string s2 = "WelcomeToGeeks";
string s3 = "Geeksforgeeks";
bool result1, result2;
// Equality operator return true
// as both strings are equal
result1 = s1 == s2;
Console.WriteLine("s1 is equal to s2: {0} ", result1);
// Equality operator return false
// as both strings are not equal
result2 = s1 == s3;
Console.WriteLine("s1 is equal to s3: {0} ", result2);
}
}
输出:
s1 is equal to s2: True
s1 is equal to s3: False
例 2:
c sharp . c sharp . c sharp . c sharp
// C# program to illustrate
// the Equality operator
using System;
class GFG {
// Main method
public static void Main()
{
// function calling
Check("GEEKS");
Check("geeks");
Check("GEEKS");
}
// Function to check the
// string for equality
static void Check(String value)
{
// string str
String str = "geeks";
// Display the comparison between strings
Console.WriteLine("String 1: {0}", str);
Console.WriteLine("String 2: {0}", value);
Console.WriteLine("Comparison of string 1 and string 2: {0}",
str == value);
}
}
输出:
String 1: geeks
String 2: GEEKS
Comparison of string 1 and string 2: False
String 1: geeks
String 2: geeks
Comparison of string 1 and string 2: True
String 1: geeks
String 2: GEEKS
Comparison of string 1 and string 2: False
不等式(字符串，字符串)运算符
该运算符用于检查给定的字符串是否包含不同的值。如果两个字符串彼此不同，则返回 true。否则，返回 false。 语法:
public static bool operator != ( string x, string y );
参数:
字符串 x: 字符串 x 是要比较的第一个字符串。 字符串 y: 字符串 y 是第二个要比较的字符串。
返回值:该运算符的返回类型为系统。布尔。如果字符串 x 不等于字符串 y，则返回真，否则返回假。 下面给出一些例子，以便更好地理解实现: 例子 1:
c sharp . c sharp . c sharp . c sharp
// C# program to illustrate the
// Inequality operator
using System;
class GFG {
// Main Method
public static void Main(string[] args)
{
// variables
string s1 = "WelcomeToGeeks";
string s2 = "WelcomeToGeeks";
string s3 = "Geeksforgeeks";
bool result1, result2;
// Inequality operator return true
// as both strings are different from each other
result1 = s1 != s3;
Console.WriteLine("s1 is different from s3: {0} ", result1);
// Inequality operator return false
// as both strings are equal
result2 = s1 != s2;
Console.WriteLine("s1 is different from s2: {0} ", result2);
}
}
输出:
s1 is different from s3: True
s1 is different from s2: False
例 2:
c sharp . c sharp . c sharp . c sharp
// C# program to illustrate the concept
// of Inequality operator
using System;
class GFG {
// main method
public static void Main()
{
// function calling
Check("GEEKS");
Check("geeks");
Check("GEEKS");
}
// method to check the string value
static void Check(String value)
{
// string str
String str = "geeks";
// Display the comparison between strings
Console.WriteLine("string 1: {0}", str);
Console.WriteLine("string 2: {0}", value);
Console.WriteLine("Comparison of string 1 and string 2: {0}",
str != value);
}
}
输出:
string 1: geeks
string 2: GEEKS
Comparison of string 1 and string 2: True
string 1: geeks
string 2: geeks
Comparison of string 1 and string 2: False
string 1: geeks
string 2: GEEKS
Comparison of string 1 and string 2: True
参考:https://docs.microsoft.com/en-us/dotnet/api/system.string?视图= net framework-4 . 7 . 2 # 操作员
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