字符串大小写敏感比较

在许多编程语言中，字符串大小写敏感比较是根据字符的Unicode编码值进行的。这意味着大写字母和小写字母被视为不同的字符。以下是一些常见编程语言中字符串大小写敏感比较的例子：

1. Python：

s1 = "Hello"
s2 = "hello"

if s1 == s2:
    print("Strings are equal")
else:
    print("Strings are not equal")  # 输出：Strings are not equal

2. Java：

String s1 = "Hello";
String s2 = "hello";

if (s1.equals(s2)) {
    System.out.println("Strings are equal");
} else {
    System.out.println("Strings are not equal");  // 输出：Strings are not equal
}

3. JavaScript：

let s1 = "Hello";
let s2 = "hello";

if (s1 === s2) {
    console.log("Strings are equal");
} else {
    console.log("Strings are not equal");  // 输出：Strings are not equal
}

在这些例子中，我们可以看到字符串"Hello"和"hello"被视为不相等的，因为它们的大小写不同。如果你需要进行大小写不敏感的比较，可以在比较之前将字符串转换为全小写或全大写：

1. Python：

s1 = "Hello"
s2 = "hello"

if s1.lower() == s2.lower():
    print("Strings are equal (case-insensitive)")  # 输出：Strings are equal (case-insensitive)
else:
    print("Strings are not equal")

2. Java：

String s1 = "Hello";
String s2 = "hello";

if (s1.equalsIgnoreCase(s2)) {
    System.out.println("Strings are equal (case-insensitive)");  // 输出：Strings are equal (case-insensitive)
} else {
    System.out.println("Strings are not equal");
}

3. JavaScript：

let s1 = "Hello";
let s2 = "hello";

if (s1.toLowerCase() === s2.toLowerCase()) {
    console.log("Strings are equal (case-insensitive)");  // 输出：Strings are equal (case-insensitive)
} else {
    console.log("Strings are not equal");
}