[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