[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 =  * 
* = * 
  =  **
  =  ** 

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

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
      * * *  *  * **  

   *****   *    *  *** {

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