将文字与可选字符串连接起来

name = "Alice"
age = 30
optional_info = "Engineer"

# 简单拼接
result1 = name + " is " + str(age) + " years old."

# 格式化拼接
result2 = "{} is {} years old.".format(name, age)

# 使用f-string（Python 3.6+）
result3 = f"{name} is {age} years old and works as a {optional_info}."

let name = "Alice";
let age = 30;
let optionalInfo = "Engineer";

// 简单拼接
let result1 = name + " is " + age + " years old.";

// 模板字符串
let result2 = `${name} is ${age} years old and works as a ${optionalInfo}.`;

String name = "Alice";
int age = 30;
String optionalInfo = "Engineer";

// 简单拼接
String result1 = name + " is " + age + " years old.";

// 使用StringBuilder
StringBuilder sb = new StringBuilder();
sb.append(name).append(" is ").append(age).append(" years old.");
String result2 = sb.toString();

// 使用String.format
String result3 = String.format("%s is %d years old and works as a %s.", name, age, optionalInfo);

StringBuilder sb = new StringBuilder(100); // 预分配100个字符的容量
for (int i = 0; i < 1000; i++) {
    sb.append("some string");
}
String result = sb.toString();

print(f"Step 1: {part1}")
print(f"Step 2: {part1}{part2}")
print(f"Final result: {final_result}")