[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