[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