在Ruby语言中的一条if语句中使用多个条件

# 使用逻辑与 (&&)
if x > 0 && y < 10
  puts "x is positive and y is less than 10"
end

# 使用逻辑或 (||)
if a == 5 || b == 5
  puts "Either a is 5 or b is 5"
end

# 使用逻辑非 (!)
if !is_valid?
  puts "Validation failed"
end

# 错误的示例
if x > 0 && y < 10 || z == 20
  puts "This might not work as expected"
end

# 正确的示例
if (x > 0 && y < 10) || z == 20
  puts "This works correctly"
end

# 使用括号明确优先级
if (x > 0 && y < 10) || z == 20
  puts "This is more readable"
end

# 拆分成多个 if 语句
if x > 0 && y < 10
  puts "x is positive and y is less than 10"
end

if z == 20
  puts "z is 20"
end