[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