[Exercise 03] Caesar Cipher Decoder

Question

You have received an encrypted message from Julius Caesar-- the message is ebiil.  You are asked to decipher the message in order to understand what Caesar trying to say to you.

Hint

Luckily, Caesar has given you a hint, he says: 'I, myself, encoded the message by shifting every word backwards by 3.' 

Solution

Write a program that receives 5 characters 'ebiil'. Then decode those characters into 5 new characters.

Example

#include <stdio.h>

int main(int argc, char *argv[]) {


	char a;
    	char b;
	 	
	scanf("%c%c", &a, &b);
	
	//decode the message how??
	
	printf("%c%c", a,b);
	
	return 0;
}

Input

ebiil

 

 

 

 

 

 

 

 

 

 

Output

hello

** REMEMBER ** 
This is an online-compiler, don't put anything except the codes. If you want to make a comment, please use // or /* */

Answer 1

Hidden content!
#include<stdio.h>

int main (int argc,char *argv)
{
    char a;
* *****   * ** * *  b;
 *    *     *******   * **   *   c;
*        *    * **     **  *  d;
*****   * ** *       *   ** *  *  e;

 *** ***  ***       * *   **  ***  * * * ****    **  *** ** * * * * *   *    *  *** ***

   ** *       * **  *  * **   ** **
* * **    **** **    ** * * *  * *
 *** *  * *     * * ** **   *  
*** *****       **       ***     *
 **  *  ** ***  *** **** * * 

  ***  *  *  ***** * **   ******* *  **  ** *   **** **    
***    * *** *  ***** *  ** * *  ***  0;
}

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 2

Hidden content!
#include *    *   ***   
int main(int argc, char *argv[]) {


 ** * * **   *   char a;
 * *      *  ***  * *  ** * b;
   * ** * *  ***  ** ** **   * c;
 * * *   *****  * **      d;
 *  *  * *  ***  ***    *  e;
** *** * ***** * *  ***  *** *  *** *  
* * * **  * * *  * **  *  **  ***  * * **   *  *   * * ** * *  * * **      ** *   *** ***
 *  ****    **** 
***     **     **  the message how??
*  ** **    **    
**  ** *  ***  * * **  * ** *   * *** ** * **     *   
 *    *   *  *  
****  ** *    return 0;
}

Comments

prog.c: In function 'main':
prog.c:10:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%c%c%c%c%c", &a, &b, &c, &d, &e);
  ^~~~~
prog.c:10:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:14:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("%c%c%c%c%c", a+3,b+3,c+3,d+3,e+3);
  ^~~~~~
prog.c:14:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:14:2: note: include '<stdio.h>' or provide a declaration of 'printf'

---

Case 0: Correct output
Case 1: Wrong output

Answer 3

Hidden content!
int main(int argc, char *argv[]) {


  * **     char a;
 **    ** * *****  *   **  * * b;
 *  *** **   char c;
*  * *   * ***  **  ***  * *  *   d;
** ** * *****  * ****  **** e;
* *  * *** *****  * * *   ** * * * **  *    
     **** **    %c %c %c %c  **       * * *** ***   *  * * ****  * * ** *  *******
 ** *    
     *   *  * * ** ***   * *****  **  ***  ****    **   * * **  *  * ** *** *** **
  ****  * ** *    ** *
     * *    * ****  * **  ******   *
***   ******  *     * **  * 
* **  * * ******* ****** *** **     
 ** ** * *   ***** * ** * *
  ***   *** *    *   * ** * *****       * ** ****  **
*   ***    **** *  *  ***
 ***  * ***  * **  0;
}

Comments

prog.c: In function 'main':
prog.c:10:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%c %c %c %c %c %c", &a, &b,&c, &d,&e);
  ^~~~~
prog.c:10:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:10:25: warning: format '%c' expects a matching 'char *' argument [-Wformat=]
  scanf("%c %c %c %c %c %c", &a, &b,&c, &d,&e);
                         ^
prog.c:12:6: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
      ^
prog.c:12:12: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
            ^
prog.c:12:18: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                  ^
prog.c:12:24: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                        ^
prog.c:12:30: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                              ^
prog.c:14:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("hello");
  ^~~~~~
prog.c:14:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:14:2: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:18:5: warning: incompatible implicit declaration of built-in function 'printf'
     printf("errol");
     ^~~~~~
prog.c:18:5: note: include '<stdio.h>' or provide a declaration of 'printf'

Answer 4

Hidden content!
**    *****  ***  ** 

      ** *   *** * *   ***    {

***  * * 
** = **** *
   = * * *
** = * ** *
* =   * 
* = ****  *

e =  * 
 * =    
  =  *  
*  = ****

   ** **   
   *  *  
    ** 
***** *
 ** * * 

 * ** ** **     ** **   **       **
 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
 ***   * ** ** *    **

*  ****** * **   *  * *** {

 * * *  
* = * *  *
* = ***  ** 
   = * *  ***
  = *  *  
  = **** **

e =    
  =  
* =  ** 
*  = **

 ** * *  
        
***** 
 ***  *  
   **   

  ** **** ***    *  * *  * *
 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

Hidden content!
#include **** ** ***  
#include ***  **      *  * 

int main(int argc, char *argv[]) {
** ***   * **   * *        **** letterj;
******     *  * *   **  * * *** letteri;
     *** ***** **  **** *    * letterm;
   *   *  *   ***     * * *  *  *  lettere;
****    * *** * *         * lettern;
   *  ** *   **    *   *  *****
**   * * ** *  ** *  **   ****    *  * * * * input the letter to encode: ");  
*******   **  ** ** *     *  
   *    * *** **   *  ***  *  *    * * *  *    &letterj, * ** *****   &letterm,    *   *   *  *****  ** 
**  *** * * **    *** **    **    +3;
 **   * ** ** *  ** *  ** *** * +3;
* ****  ****** *****  * ** * * +3;
     * * * *    *          ** * **         +3;
 * ***   *  * **    ** *********   +3;
** *  *****    * * 
 *** *   ***  ****  *   **
   ***   ****   *  ****   *** *  **  ***  * *   ***** * ** lettere, lettern);
  ** *** *    *   ** *  ***
*   *     *  **   *   ** **   0;
}


INPUT
* ***      ***   *  *
*   ** ** * *
OUTPUT
   ** **  **** *  

Comments

prog.c:27:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:30:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:30:1: error: unknown type name 'OUTPUT'

Answer 7

Hidden content!
  **    **** ** * ** *

int * *** argc, char * ** {


   ** *  * **  char a;
    ***   ** *    **  * * *   *****   ** ** char b;
*** ***  ** * * * * * ****  **    
**** *  ** ******     *   * *    ***   *  * *    *  *
**  *** **  **  ** 
 *** * * *** *** *  * *   the     how??
**       *** 
 * * **            *   ** *******  * a,b);
 *     *     *   
  *** *    **  *  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 8

Hidden content!
#include *  *   * ** *

int main(int argc, char *argv[])
{
   ** * * **** ** * letterj;
********** ** *    **  *** * letteri;
** * * ** * ******** *    *** letterm;
 * * * ***** ****** **  ** * lettere;
 *** **  *  ***** *    ***** * ** lettern;
**   *  **  ** *  *     *** *
 ****   *   * **  ** **  *  *  ***  **   *   input the letter to encode: * *  *   **** 
   *    ** * *   **  *  * *   **  *******       *  ** ***    **** * ****    **   ****** ** **  **   *   * ***    *   * ** *  **
 * *    ** * ****    * * * 
**** * *  * ** **   * ****  * ** **  = letterj +3;
* *     *   * ** ****    *** ***   = letteri +3;
    **** ** *   *      ***** **  *   = letterm +3;
   * *  *   * * * ** * ** *       * *   = lettere +3;
       **   *  *  * ***    * **** = lettern +3;
*   *** * ****        * ** 
* **    ***   *  ******  *** **** *    **   ***** *  * ** *** *  *   lettere, lettern);
  *** *  *   *  * ** * ***

 ***** *  * ***  * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 9

Hidden content!
* *   ** ** ****  * *

*  *   ** ****  * **  * {

      *   
*  = *      
 * =   ***
i =   * *
* = *  * 
  =   *
e = * 
* = * *
* = * 
* =  **

 *  **    
 * *****
*  **** * 
 ****  
**   * **

***  *   ** *****     ****  **   *

Comments

prog.c:1:16: fatal error: stdio: No such file or directory
 #include<stdio>
                ^
compilation terminated.

---

prog.c: In function 'main':
prog.c:6:5: error: 'cin' undeclared (first use in this function)
     cin >> a;
     ^~~
prog.c:6:5: note: each undeclared identifier is reported only once for each function it appears in
prog.c:11:5: error: 'cout' undeclared (first use in this function)
     cout << a << endl << endl;
     ^~~~
prog.c:11:18: error: 'endl' undeclared (first use in this function)
     cout << a << endl << endl;
                  ^~~~

---

prog.c: In function 'main':
prog.c:6:11: warning: too many arguments for format [-Wformat-extra-args]
     scanf("c", &a);
           ^~~
prog.c:11:14: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char *' [-Wformat=]
     printf("%c", a)
              ^
prog.c:12:5: error: expected ';' before 'return'
     return 0;
     ^~~~~~

---

prog.c: In function 'main':
prog.c:6:11: warning: too many arguments for format [-Wformat-extra-args]
     scanf("c", &a);
           ^~~
prog.c:11:14: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char (*)[5]' [-Wformat=]
     printf("%c", &a);
              ^

---

Case 0: Correct output
Case 1: Wrong output

Answer 10

Hidden content!
#include **** *    
#include ****     *** ** * 

int main(int argc, char *argv[]) {
** * ** ***   *   * *  *    **       letterj;
**** **** *       * ** **  letteri;
   **   * ***  * * **** **    letterm;
 ***  * *** *    ****  *** lettere;
 *    *** *  ***     **** *  ** lettern;
*  ***   *   **  *   *  **
     *    ***  *    *    * **    *  * **  *  input the letter to encode:  ***  *   
  *  *** **  ****  ***  ** * * *** ****  * *      ***  *** *  *   *** *     **** * ** *  **      *   *   ******     **** ** * * ** *  *** *    *
 * *   **       * **  
 ******** *     * letterj = letterj +3;
 * ** ** ** * **   **     **      ** = letteri +3;
   **   ** ** * ***** **       = letterm +3;
**    *    *  *   ****   = lettere +3;
****  **** * * ****   * * ** * * = lettern +3;
* *  * * * * *  ** *  * ***  *   
 *** *     **   *****  *    ** *  *** *  *   * ******  ** *   *      *    ** ** **  lettere, lettern);
 * ****** *   ***  **   
  ***     **      *** **  * **  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output