[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