[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