[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

Hidden content!
#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

Hidden content!
#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

Hidden content!
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

Hidden content!
**  *  ** ** ***    

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*     * * 
 =  *** ** 
  = **  *    
   =  ** ** 
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* =   **   *

e =    
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* =   *
*  =    

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******
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*    *** ** ****  **     * *   *  * 
 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
**** *     **  ** ** *

***   ***  *        * **  {

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* = * ** * 
  = * *   *
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e =   
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** = ** 

**   *** ** 
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** *

* *******  ***  ****  * *    **   
 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

Hidden content!
#include  * *    * *  
#include   * **  *** *   *

int main(int argc, char *argv[]) {
     * *   * *  * *    **  * *  letterj;
* *    ** *** **** * **    **  letteri;
*  * ** *  **** *   **  **  letterm;
**   ** *   ** **** *  * * *  *   lettere;
**   *** ** *    *   *** **  ** lettern;
**  *****     * *  ******* * * 
* ** ***    ****** * **   *   ** ** **   **** input the letter to encode: ");  
**   *  *   *   ***   *****
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*   * *      *****     ** **    *** +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

Hidden content!
*    ** **     **  * * *

int *   *  argc, char **    {


* *** ***    ***  char a;
****  **  ****   * *  *  *   ****  ** * ****  char b;
*  * * ** ***  * ***         *  **  
 *  ***     *  * ***********   * *    *     **** ** 
  * *   **  
 **  *** *** *      the  **     how??
****   *  * * 
  *    ****  * *  *  * * *  * ** **   * a,b);
 **** *  *** 
*     *   **    * ** * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 8

Hidden content!
#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

Hidden content!
   *   * *** * *

 *  **   ****    * ***  {

    *  *
* =   ***
 * = **  ***
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

Hidden content!
#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