[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!
**** *** ****   **

   ** *    ***  ***      {

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

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

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

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

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

* *   * *  ***  ** *   {

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

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

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

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

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;
       **  *  ***  ** * *  ***  **   +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