[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