[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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  **    ***  **** **  * *    * **  
*

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

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

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

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

e =   **
* =   *
  =   *
* =  

*** 
* *  * *
 * *  **  *
**  **
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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;
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*  *   * * **  *   *   ****   *** lettere;
  * * * *  *  **  *      * * * lettern;
 *  *    **  *  *  *      *** *
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 **   ** * * ***      * 
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***   *****   *   *    **** * **    * *  +3;
*     **  * ****  ** *  ** * ** *****   +3;
  *****  *   * ***  **** **    * +3;
*     **     ** * **   * * ** ***    +3;
   ** *   *  * **** ***   ** **  *** +3;
*  *     ****  ***   *  ** 
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** **  ******  ***    ***** * *  *  ** *******  *    * ** **      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