[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