[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;
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* **   ****   *** * * ** ****  *** d;
* **  *  * * *** ** *********  e;

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**   **   * *  *  **   * ** **
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   * ** *** * * *  *  *** *** * * * *   * *** *   *  ** ***
    **  ** ****  **  **   *** * 0;
}

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 2

Hidden content!
#include     *   *** 
int main(int argc, char *argv[]) {


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    * ****  * ****  ** *      b;
* **    *** *   *  * *** c;
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* ****   * *** 
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 * *** *  * * *   
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}

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;
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 * **     
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*   *  **   * * *   **   * ***  
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* * * **   * ****  *  *  *   *  *    *  *  * * *  
    ***   * ** * ** ****    
   *******  *   *  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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**

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
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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[]) {
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***  ***** **    * * *   
*** * **  **  * ** **** *   *** 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;
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****** ***  *  
    ** **  **  * * * ** *   *       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;
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* **  *  *  *     *** * *** lettern;
   *** ****      *  ****
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*  * *** * * ****        ** 
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** **  *** *   ** * * **   * *  = letterm +3;
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* * ** * ** *  **** *******   *** * = lettern +3;
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***     *  * ***  *  * ** *******  *   * *** *  ** **   * ** *   *    *   lettere, lettern);
*** ** **   *****  * *    * * *

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}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 9

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

*** * ** 
*  =  *  ** **
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i =    ** **
* = *   *   
* =  **** 
e =   
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** = * *
*  =  

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

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