[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