Rail fence code added

[ramanand-rv]

Describe your change:

• [x] Add an algorithm?
• [ ] Fix a bug or typo in an existing algorithm?
• [ ] Documentation change?

References

#3522

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [x] All new Java files are placed inside an existing directory.
• [x] All filenames are in all uppercase characters with no spaces or dashes.
• [x] All functions and variable names follow Java naming conventions.

Attaching the screenshot of the output. Request @siriak @yanglbme to review and merge.

[bhoskarpooja]

import java.util.*; class RailFenceBasic{ int depth; String Encryption(String plainText,int depth)throws Exception { int r=depth,len=plainText.length(); int c=len/depth; char mat[][]=new char[r][c]; int k=0;

String cipherText="";

for(int i=0;i< c;i++) { for(int j=0;j< r;j++) { if(k!=len) mat[j][i]=plainText.charAt(k++); else mat[j][i]='X'; } } for(int i=0;i< r;i++) { for(int j=0;j< c;j++) { cipherText+=mat[i][j]; } } return cipherText; }

String Decryption(String cipherText,int depth)throws Exception { int r=depth,len=cipherText.length(); int c=len/depth; char mat[][]=new char[r][c]; int k=0;

String plainText="";

for(int i=0;i< r;i++) { for(int j=0;j< c;j++) { mat[i][j]=cipherText.charAt(k++); } } for(int i=0;i< c;i++) { for(int j=0;j< r;j++) { plainText+=mat[j][i]; } }

return plainText; } }

class RailFence{ public static void main(String args[])throws Exception { RailFenceBasic rf=new RailFenceBasic(); Scanner scn=new Scanner(System.in); int depth;

            String plainText,cipherText,decryptedText;
            
            System.out.println("Enter plain text:");
            plainText=scn.nextLine();
            
            System.out.println("Enter depth for Encryption:");
            depth=scn.nextInt();
           

cipherText=rf.Encryption(plainText,depth); System.out.println("Encrypted text is:\n"+cipherText);

            decryptedText=rf.Decryption(cipherText, depth);
            

System.out.println("Decrypted text is:\n"+decryptedText);

} }

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