[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