[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