摘要:
数组可以存放任意类型,初始化时候的类型 决定了数组后面可以添加什么类型的元素let 不可变数组let arrayC = [1,2,3,4,5,6,7]var 可变数组var arrayM = [1,2,3,4,5,6,7]数组元素个数print(arrayC.count)通过下标访问数组元素prin... 阅读全文
摘要:
1.字符串拼接var num1 = "hello,world"var name = "xiaoming"var age = 18let student = num1 + namelet info = name + String(age)print(name + "\(age)")2.字符串判断与比... 阅读全文