[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 =   *
* =  ** 
  =   
*  = *  

** ***  **
   ****
 * ** 
  ***   
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 * *   *** *  *    * * **** ***  * **
 

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