[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