[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