[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