[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: ");  
** * *   **  *  *     ** 
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 ** *   * ****  *** *     ****  ** +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