Kotlin 高中程式練習題 a009: 解碼器

Kotlin 高中程式練習題  a009: 解碼器

　在密碼學裡面有一種很簡單的加密方式，就是把明碼的每個字元加上某一個整數K而得到密碼的字元（明碼及密碼字元一定都在ASCII碼中可列印的範圍內）。例如若K=2，那麼apple經過加密後就變成crrng了。解密則是反過來做。這個問題是給你一個密碼字串，請你依照上述的解密方式輸出明碼。

至於在本任務中K到底是多少，請自行參照Sample Input及Sample Output推出來吧！相當簡單的。

K=7

範例輸入

1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu5
1PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5

範例輸出

*CDC is the trademark of the Control Data Corporation.
*IBM is a trademark of the International Business Machine Corporation.

var s= "1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu51PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5"
var s1= "1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu5"
var s2= "1PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5"
var i=0
var c=0
var c1=0
fun main() {
for (i in 0..(s.length-1))
    print(s.toCharArray()[i])
 
    println("") 
    println(s1)
    println(s2)
 
    println("") 
    for (c in s1) {
        c1=c.toInt()-7
    print( c1.toChar())
}
 
    println("") 
    for (c in s2) {
        c1=c.toInt()-7
    print( c1.toChar())
}
     
}

輸出畫面

1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu51PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5 1JKJ'pz'{ol'{yhklthyr'vm'{ol'Jvu{yvs'Kh{h'Jvywvyh{pvu5 1PIT'pz'h'{yhklthyr'vm'{ol'Pu{lyuh{pvuhs'I|zpulzz'Thjopul'Jvywvyh{pvu5 *CDC is the trademark of the Control Data Corporation. *IBM is a trademark of the International Business Machine Corporation.