[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