[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