[Exercise 03] Caesar Cipher Decoder

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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 /* */

[Exercise] Coding (C) - asked in Chapter 2: Syntax structure of the C language by (5.9k points)
ID: 26955 - Available when: Unlimited - Due to: Unlimited
edited by | 6.7k views

22 Answers

0 like 0 dislike 
Hidden content!
**** *  ****   * * *

int    *  argc, char  ****** {
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* * **   ** ** * 
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}
100/100 answered by (449 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
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100/100 answered by (153 points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
#include * ***  ** * * * 
#include ** *   * *     * 

/* run this program using the console pauser or add your own getch,  * * *  *    * *    * or input loop */

int main(int argc, char *argv[]) {
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*** * *   *** *   *  * **     * b;
** * *  * *   * **  ***** * * c;
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** *    * *   * ****** **  ** = getchar();
    **  **     * * **  **** = e+3;
****  **     *   **** * * ** ******** * 
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 *   ****  **  *** * * ***
*  ** *** * * ***  * * ***  *   **  0;
}
100/100 answered by (281 points)
edited by
0 0
Your program receives only 2 characters, and it doesn't move characters' positions.

Try to make it receive 5 characters, and move their positions forward by 3.
commented by (5.9k points)
0 0
This exercise expects only 'hello'. However, your code has.....

printf("Put the words you want to decode:");

Kindly consider delete this part :)
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
**** ** * **   **
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int    ***  char **   {
/*
****      *  */

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a = a+3;
b = *  
c = **  
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e =   *

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

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** **  *** **   *** * *     **   0;
}
100/100 answered by (273 points)
edited by
0 0
prog.c:28:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:32:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:32:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
0 0
Your program can end at
  
    return 0;
}
------------------------------------------
You don't need to put

INPUT

ebiil

OUTPUT

hello
commented by (5.9k points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
*****  ********* ** 
 ** ** * ** *  * ***  

/* run this * ***  * the   **      or add your own   *    ** ***   *   * **  *  or *    * */

int *   *  char  ****  {
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}
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** * ** *  *  **  0;
50/100 answered by (252 points)
0 0
prog.c: In function 'main':
prog.c:19:2: error: expected declaration or statement at end of input
  return 0;
  ^~~~~~
commented by (4.3k points)
0 0
Great job using an array and a loop. There are two mistakes found in your code. Please check
1.     printf("\n\n%s", code);  <--- in order to make it match the fixed output '\n\n' should be deleted
2.     At the end of your code, there's something missing.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
***  * * **   ****  
*
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*
**  * *    **    *  *  ***   * **     * *  *   * * *  *       *   **  *   *     **  
 
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*  =   *
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**  = c + *

** = d +  *
*
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*
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*
100/100 answered by (268 points)
0 0
It's correct lol you can't judge me
commented by (268 points)
0 0
Well, that's because your output doesn't match with the fixed answer. Please take a look at this
printf("%c%c%c%c%c\n", a1, b1, c1, d1, e1);

Hint: You should delete something  :)

By the way, great job.
commented by (5.9k points)
0 0
printf("%c%c%c%c%c", a1, b1, c1, d1, e1);

How's that?
commented by (268 points)
0 0
That's correct.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
*   * ** ***   * *   
 *****  * ** ** ***

int ****** argc, char   *  {
    * **   ***** char ***  *
      *   **   char *  **
** ***** *  *** * char **  
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 *       **   ****  * ***   **   input the letter to  *  * * * *** 
*  *     ****  * 
*  * ***  ** * *  *          * ** ** *    * * ***  * * * **  ** * *      *   *   ** **  *****  ****** *********
**     *  ** **  *  ***   = *    + 3;
* **   * ** *  ** = *** + 3;
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     *  * *  * * ** letterc =    *  + 3;
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  ***  * *** *    ** *** ** ****    * *    *     *  *    ***  *    * *
 **    *    * 
**** *  *** * *  return 0;
}
100/100 answered
reshown by
0 0
-----------Re-judge-----------
Case 0: Wrong output
commented by (4.3k points)
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     hello

Anyway, great job. Full marks.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
*  *   ** ***  **** *
 *   *    *   **  ****** **    

int   *  * argc, char *argv[]) {
 **     ** *  * ** char    * * 
  *****   ****   char letteri;
*     **   *****   char   * 
**  * ***  ** * ** char * * *** 
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****  **  *    *  * *  ** ** *  input the letter to encode:    **     *  
* **    *****     
    * *   *   ** * * * *  * **  *  *    *  ***  * ** * *****  ***    **  * ***  **** *     * ** ***       
   ***   ***  ** ***  **  +3;
 *  **    * **          *   +3;
*   ** * ***  *  * **  ****  +3;
* *  * * * ****  *** **   * +3;
**   **  *  *        *  +3;
*  * ** ***** * * 
*  *   *   
*  *** * **  ****** *  ** * *****  ** * *****   **   * ** * * *   
* * *   * * *  * 
*** ** *  * * ***  return 0;
}


INPUT
**** ***  * *  **  *  
   *** ** **** 
OUTPUT
   *  ** *  *  *
100/100 answered by (269 points)
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     hello

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.
commented by (5.9k points)
0 0
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'
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
   *     ** * * ***   **
*  *  *  * ***    * *    **

int  * *  argc, char  * {
  **      ****  *  char * * 
* **  *   * *      char *  ***
 **  * * *   char ** *
*** *  * ** *** char    **
* * ***   *  *** char  *  *
** * * * ****   
 *   *** ***  ****  ******** input the  *    to *  ***  * **  ***    
* **  *    * 
 ***   * ****  *    * * **  * **  *** * *** ** ** * *** * ** * ****   *** **  **   ***  * **  ** ****   **
      *  * *  ** 
   ****    ** * letter = letter + 3;
* ** **** ***   *     = **    + 3;
*** *** **  *  ** * =   ** + 3;
  ***** **   ** **   * =   *   + 3;
***  * ****** **** = *     + 3;
   **  ** * * * * 
 **** *  * ***   ** *  *   *   * * letter is **    *** *    *   * *** **   *   * *   *  *  
  *** **  * * *    
* ****   * ** return 0;
}

INPUT
***** ** ** * * 
** *** * ** *
   
 * * **     ****
100/100 answered by (290 points)
reshown by
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     The encrypted letter is hello

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.
commented by (5.9k points)
0 0
prog.c:26:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:29:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:29:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
#include *           ***

int main(int argc, char *argv[]) {
    ** **  *  ** *     **  ** lettera;
*    *   ** *    ****    *  letterb;
 *  ****  **    *   ***   letterc;
 ***  ***  ** **   *** * *  letterd;
*  ***  * *****  * **    * *   lettere;
  ** **   ****** * *   ***  *   *
 ***   *  ***   *   *  ****  ***** * ** %c %c %c * **** * *   **  * **   *   *** **  **  * *  *  *  **** *  ** * ** ** *** 
******  * ** **  * ****      **** = lettera + 3;
 *********** **** * ** **    = letterb + 3;
  **  *****   * *** * * ****   * = letterc + 3;
  ** ***** *  *   *       * *    = letterd + 3;
**    ***       * ****  ****   * = lettere + 3;
   ** *     ****  * *  * *** * **    **   **** * *** * 
    *** ** * ***   ** *  *     *      *    %c %c %c ** **   *** letterb, * * *  * ****    * 
* *     * ***** **  *  * * **
* ** *  ** * *  * * **   *  ** 0;
}

 * * *
  * *
*   * *  *  *
   * 
//hello
100/100 answered by (271 points)
edited by
0 0
Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: e b i i l
     h e l l o

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.
commented by (5.9k points)
0 0
prog.c:25:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:28:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:28:1: error: unknown type name 'OUTPUT'
commented by (4.3k points)
0 0
prog.c: In function 'main':
prog.c:10:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%c %c %c %c %c", &lettera, &letterb, &letterc, &letterd, &lettere);
     ^~~~~
prog.c:10:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:17:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
     printf("%c %c %c %c %c", lettera, letterb, letterc, letterd, lettere);
     ^~~~~~
prog.c:17:5: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:17:5: note: include '<stdio.h>' or provide a declaration of 'printf'
commented by (4.3k points)
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