[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