[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