[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