[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