[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