[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