[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