[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