{"id":20834,"date":"2022-11-11T02:15:45","date_gmt":"2022-11-10T20:45:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-java-incrementing-every-character-in-a-string-by-a-large-amount\/"},"modified":"2022-11-11T02:15:45","modified_gmt":"2022-11-10T20:45:45","slug":"solved-java-incrementing-every-character-in-a-string-by-a-large-amount","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-java-incrementing-every-character-in-a-string-by-a-large-amount\/","title":{"rendered":"[Solved] Java incrementing every character in a string by a large amount?"},"content":{"rendered":"

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First I’m going to remove all of the I\/O (except for outputting the result), get rid of the decryption piece for brevity, and write encrypt(String)<\/code> and encrypt(char)<\/code> as pure functions<\/a>.<\/p>\n

public class EncryptionMain {\n\n    public static void main(String args[]){\n        System.out.println(encrypt(\"Hello\"));\n    }\n\n    static String encrypt(String plaintext) {\n        StringBuilder ciphertext = new StringBuilder(plaintext);\n        for (int i = 0; i < ciphertext.length(); i++) {\n            ciphertext.setCharAt(i, encrypt(ciphertext.charAt(i)));\n        }\n        return ciphertext.toString();\n    }\n\n    static char encrypt(char c) {\n        int switchInc = 1; \/\/ 0 = BACK 1 = FORWARD\n\n        for(int e = 0; e < 1000; e++){\n            if (c == '!') {\n                switchInc = 1;\n            } else if (c == '~') {\n                switchInc = 0;\n            }\n\n            switch (switchInc) {\n                case 0: c--; break;\n                default: c++; break;\n            }\n        }\n        return c;\n    }\n}\n<\/code><\/pre>\n
And, whoops! – just by doing that, I accidentally fixed the bug. Here, I’ll add it back:<\/p>\n
public class EncryptionMain {\n\n    public static void main(String args[]){\n        System.out.println(encrypt(\"Hello\"));\n    }\n\n    static String encrypt(String plaintext) {\n        StringBuilder ciphertext = new StringBuilder(plaintext);\n        for (int i = 0; i < ciphertext.length(); i++) {\n            ciphertext.setCharAt(i, encrypt(ciphertext.charAt(i)));\n        }\n        return ciphertext.toString();\n    }\n\n    static int switchInc = 1; \/\/ 0 = BACK 1 = FORWARD\n\n    static char encrypt(char c) {\n\n        for(int e = 0; e < 1000; e++){\n            if (c == '!') {\n                switchInc = 1;\n            } else if (c == '~') {\n                switchInc = 0;\n            }\n\n            switch (switchInc) {\n                case 0: c--; break;\n                default: c++; break;\n            }\n        }\n        return c;\n    }\n}\n<\/code><\/pre>\n
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Edit – Here’s a working Caesar cipher I referred to in the comments below.<\/p>\n
main\/cipher\/Cipher.java<\/em><\/p>\n
package cipher;\n\npublic final class Cipher {\n\n    public Cipher(Range range, int key) {\n        this.range = range;\n        this.key = key;\n    }\n\n    public final Range range;\n    public final int key;\n\n    public String encrypt(String plaintext) {\n        return cipher(plaintext, key);\n    }\n\n    public String decrypt(String ciphertext) {\n        return cipher(ciphertext, -key);\n    }\n\n    String cipher(String in, int n) {\n        StringBuilder out = new StringBuilder(in.length());\n        for (int i = 0; i < in.length(); i++) {\n            out.append(range.shift(in.charAt(i), n));\n        }\n        return out.toString();\n    }\n}\n<\/code><\/pre>\n
main\/cipher\/Range.java<\/em><\/p>\n
package cipher;\n\npublic final class Range {\n\n    public final char min;\n    public final char max;\n    public final int size;\n\n    public static Range inclusive(char min, char max) {\n        return new Range(min, max);\n    }\n\n    Range(char min, char max) {\n        this.min = min;\n        this.max = max;\n        size = max - min + 1;\n    }\n\n    \/** Shift c up by i places, wrapping around to the\n     * beginning of the range when it reaches the end. *\/\n    public char shift(char c, int i) {\n        return (char) (min + mod(c - min + i, size));\n    }\n\n    \/** x mod a *\/\n    static int mod(int x, int a) {\n        return ((x % a) + a) % a;\n    }\n}\n<\/code><\/pre>\n
test\/cipher\/CipherTest.java<\/em><\/p>\n
package cipher;\n\nimport org.testng.annotations.Test;\n\nimport static org.testng.Assert.assertEquals;\n\npublic class CipherTest {\n\n    @Test\n    public void testZeroKey() throws Exception {\n        Cipher cipher = new Cipher(Range.inclusive('a', 'z'), 0);\n        assertEquals(cipher.encrypt(\"abcxyz\"), \"abcxyz\");\n        assertEquals(cipher.decrypt(\"abcxyz\"), \"abcxyz\");\n    }\n\n    @Test\n    public void testOneKey() throws Exception {\n        Cipher cipher = new Cipher(Range.inclusive('a', 'z'), 1);\n        assertEquals(cipher.encrypt(\"abcxyz\"), \"bcdyza\");\n        assertEquals(cipher.decrypt(\"bcdyza\"), \"abcxyz\");\n    }\n\n    @Test\n    public void testSizePlusOneKey() throws Exception {\n        Cipher cipher = new Cipher(Range.inclusive('a', 'z'), 27);\n        assertEquals(cipher.encrypt(\"abcxyz\"), \"bcdyza\");\n        assertEquals(cipher.decrypt(\"bcdyza\"), \"abcxyz\");\n    }\n}\n<\/code><\/pre>\n
test\/cipher\/RangeTest.java<\/em><\/p>\n
package cipher;\n\nimport org.testng.Assert;\nimport org.testng.annotations.Test;\n\nimport static org.testng.Assert.assertEquals;\nimport static cipher.Range.mod;\n\npublic class RangeTest {\n\n    @Test\n    public void testSize() {\n        Assert.assertEquals(Range.inclusive('a', 'c').size, 3);\n    }\n\n    @Test\n    public void testMod() throws Exception {\n        assertEquals(mod(-2, 5), 3);\n        assertEquals(mod(-1, 5), 4);\n        assertEquals(mod(0, 5), 0);\n        assertEquals(mod(1, 5), 1);\n        assertEquals(mod(2, 5), 2);\n        assertEquals(mod(3, 5), 3);\n        assertEquals(mod(4, 5), 4);\n        assertEquals(mod(5, 5), 0);\n        assertEquals(mod(6, 5), 1);\n    }\n\n    @Test\n    public void testShift() throws Exception {\n        Range r = Range.inclusive('a', 'd');\n        Assert.assertEquals(r.shift('a', -2), 'c');\n        Assert.assertEquals(r.shift('a', -1), 'd');\n        Assert.assertEquals(r.shift('a', 0), 'a');\n        Assert.assertEquals(r.shift('a', 1), 'b');\n        Assert.assertEquals(r.shift('a', 2), 'c');\n        Assert.assertEquals(r.shift('a', 3), 'd');\n        Assert.assertEquals(r.shift('a', 4), 'a');\n        Assert.assertEquals(r.shift('a', 5), 'b');\n    }\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            17<\/span> <\/p><\/div>\n<\/div>\n
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solved Java incrementing every character in a string by a large amount? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] First I’m going to remove all of the I\/O (except for outputting the result), get rid of the decryption piece for brevity, and write encrypt(String) and encrypt(char) as pure functions. public class EncryptionMain { public static void main(String args[]){ System.out.println(encrypt(“Hello”)); } static String encrypt(String plaintext) { StringBuilder ciphertext = new StringBuilder(plaintext); for (int i … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[323,391],"class_list":["post-20834","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java","tag-loops"],"yoast_head":"\n[Solved] Java incrementing every character in a string by a large amount? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-java-incrementing-every-character-in-a-string-by-a-large-amount\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Java incrementing every character in a string by a large amount? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First I’m going to remove all of the I\/O (except for outputting the result), get rid of the decryption piece for brevity, and write encrypt(String) and encrypt(char) as pure functions. public class EncryptionMain { public static void main(String args[]){ System.out.println(encrypt("Hello")); } static String encrypt(String plaintext) { StringBuilder ciphertext = new StringBuilder(plaintext); for (int i ... 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