[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