[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