[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