[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