458 - The Decoder

This problem is writing a complete program that will correctly decode a set of characters into a valid message. It should read a given file of a simple coded set of characters and print the exact message that the characters contain. The code key for this simple coding is a one for one character substitution based upon a single arithmetic manipulation of the printable portion of the ASCII character set. For the complete information The Decode Problem

Here is soulution with java code 

import java.util.Scanner;

class Decode{

   public static void main(String args[]){

     Scanner s=new Scanner(System.in);

     char c;

     String kal;

     while((s.hasNext())){

       kal=s.nextLine();

       if(kal.isEmpty()==false){

        for(int i=0;i<kal.length();i++){

           c=(char) (kal.charAt(i)-7);

           System.out.print(c);

        }

        System.out.println();

      }else break;

    }

   }

}

 Here is ansi c code

#include <stdio.h>

main() {

   char *str;

   char c;

   int i;

   while(scanf("%s",str)!=EOF){

       for(i=0;i<str[i]!='\0';i++){

          c=str[i]-7;

            printf("%c",c);

       }

       printf("\n");

    }

}

Here is c++ code

#include <iostream>

using namespace std;

int main() {

   char str[255];

   char c;

   while(cin>>str){

       for(int i=0;str[i]!='\0';i++){

          c=str[i]-7;

            cout<<c;

       }

       cout<<endl;

    }

   return 0;

}