[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