[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