[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!
 * ****   **  * ** ***

*            * **   *   {

 **  ** 
*  =  * * * *
  = ** **
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 * =   ** *
 * = *   **

e =  ***
* =  ***
* = *
* =  **

 *** *  
**  * *
****   **
*****
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 *    ** **  ** ************ ** *
*

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