[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