[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