[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