ASCII

新建AsciiDemo.kt

举个栗子：获取a的ascii

fun main(args:Array<String>) {
    //获取字符ascii编码
    val c: Char = 'a'
    //字符转成十进制
    val value: Int = c.toInt()
    println(value)//97
}

举个栗子：获取多个字符的ascii

//获取多个字符
    val str:String = "I love you"
    //遍历获取每个字符的ascii
    val array = str.toCharArray()
    val stringBuilder = StringBuilder()
    for(ch in array){
        //println(ch)
        val result = ch.toInt()
        stringBuilder.append(result.toString()+" ")
    }
    println(stringBuilder.toString())

改造以上的栗子

//获取多个字符
  //获取多个字符
    val str = "I love you"
    //遍历获取每个字符的ascii
    val array = str.toCharArray()
    val result = with(StringBuilder()){
        for(ch in array){
            //println(ch)
            val result = ch.toInt()
            append(result.toString()+" ")
        }
        toString()
    }
    println(result)

凯撒加密算法

举个栗子：A->B

//移动字符
    val c = 'A'//->B
    //获取ascii
    var ascii = c.toInt()
    val key = 1
    //移动
    ascii += key
    val result = ascii.toChar()
    println(result)//B

加密字符串

class CaesarCrypt {
    /**
     * 加密
     * @param command 原文
     * @param key 密钥
     */
    fun encrypt(command: String, key: Int): String {
        val charArray = command.toCharArray()
        return with(StringBuilder()) {
            charArray.forEach {
                var ascii = it.toInt()
                ascii += key
                append(ascii.toChar())
            }
            toString()
        }
    }
}
fun main(args: Array<String>) {
    val command = "I love you"
    val key = 1//密钥
    println(CaesarCrypt().encrypt(command, key))
}

解密字符串

 /**
     * 解密
     * @param command 加密的密文
     * @param key 密钥
     */
    fun decrypt(command: String, key: Int): String {
        val charArray = command.toCharArray()
        return with(StringBuilder()) {
            charArray.forEach {
                var ascii = it.toInt()
                ascii -= key
                append(ascii.toChar())
            }
            toString()
        }
    }
    println(CaesarCrypt().decrypt("J!mpwf!zpv",1))

I love you

    val ch = 'A'
    val ascii = ch.toInt()
    //二进制
    val binary = Integer.toBinaryString(ascii)
    println(binary)//1000001，8位，1个英文字符占1个字节