[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