[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;
**** **  ****    *  *  * * *
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  * *   * **** *  * ***  
*  ** * * * *  **   *    ******   ******** ** *  * &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