[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