[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