[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