[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