[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