[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