[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