[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