[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

內容已隱藏
#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

內容已隱藏
#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

內容已隱藏
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

內容已隱藏
    ***  **  **  *  

** * * * * **       **  *  {

***  *  *
* =     
* =  **    *
 = * *  *  
*  =  ***  *
* = * ****

e =   
 * = *  
  = **
  =    

**  **
  * *
** *   ** 
    *  *
* ** ** **

 *** ** *   ** *  * *  ** ** * *

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

內容已隱藏
  ** *    ****    *** 

 *  *  * * *  * *  * {

*   ****  
  =    * *
 * =  ***   **
 = * *   **
*  =  *     
 * = ***    

e =  * 
  = *  *
   = ***
 = *  

 *  ** *
   **
       *
**    **
  * **  * 

** *   * *   * *     ** **   ** *
**

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

內容已隱藏
#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

內容已隱藏
* *  * **** * *** 

int * *  * argc, char *** *** {


* ******  **** ***  char a;
 *** *      * * *  ** *  * *    * *** * * char b;
 ** ** * * *** * **   **  *  * ** *  * 
* ****   * **     *  *   **    ****  *  * ** * **   *****
 * ** * *****  
* *****   ** *  *  **   the *** * how??
 *   * ** **   
* ***   * **    ** * **    **     a,b);
 ** ** *   ** 
 **    * **  *  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 8

內容已隱藏
#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

內容已隱藏
           **  *** * *  

* * * *  *    *   *  **** {

* **  *** **
* = *****  
* = *  *
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

內容已隱藏
#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