hello house, i have a project am working on presently, its about using C language to encrypt data. the code has been written and working but my problem is this,

if i need to encrypt "how are you today" the program only takes the 1st string and encrypt it (how) and neglect the rest, but if
the strings are written together like this "howareyoutoday", the program will encrypt it perfectly. please C gurus in the house help!!!

Paste your code here...

// cesar cipher in c
// code by Temas84
#include <stdio.h>
#include <string.h>
#define SIZE 1000


int main()
{ int a,k;

printf("CAESAR CIPHER CODED BY TEMAS\n\n";

char ourinput[SIZE];

int count=0;

printf("Please Enter Your text to be Encrypted Or Decrypted\n\n";

scanf("%s",&ourinput);

printf("Please Choose 1 for Encrypting OR 2 for Decrypting\n\n";

scanf("%d",&a);
printf("please Enter the number of shift you want\n";
scanf("%d",&k);

switch (a)
{
case 1:
for(count=0;count<SIZE;count++)

{ int i;
if (isalpha(ourinput[count]))
{
ourinput[count]= tolower(ourinput[count]);

for (i=0;i<k;i++)
{
if (ourinput[count]=='z')
ourinput[count]='a';

else
ourinput[count]++;
}

}


}
printf("The encrypted data is %s", ourinput);
exit(0);
break;

case 2:
for(count=0;count<SIZE;count++)

{ int i;

if (isalpha(ourinput[count]))
{
ourinput[count]= tolower(ourinput[count]);

for (i=0;i<k;i++)
{
if (ourinput[count]=='a')
ourinput[count]='z';

else
ourinput[count]--;
}

}


}
printf("The Decrypted data is %s", ourinput);
exit(1);
break;


default:
printf("wrong selection\n";
exit(3);
}

printf("The encrypted data is %s", ourinput);

getchar();
return 10;

}

Temas: the program only takes the 1st string and encrypt it (how) and neglect the rest, but if
the strings are written together like this "howareyoutoday"

.

First of all some methods/functions are missing in your program.

BUT i think this happens because a 'white space' is not seen as a character and you are using a char[]. So it stops the encryption when it reaches the white space. I would have loved to see what isalpha() does...

OPTION 1:

use a String[] instead of a char[]

OPTION 2

convert the String to a char[] before encryption

But it all depends on what the isalpha() does...Hope this helps...

You can also try something like this...

     if (ourinput[count]==' ')
                  ourinput[count]=' ';

Thanks for your response, am using the isalpha to make sure the input or text are all alphabet. Will try ur suggestion and get back.

your problem is most likely from isalpha().

Temas: Thanks for your response, am using the isalpha to make sure the input or text are all alphabet. Will try ur suggestion and get back.

Your welcome but my previous suggestions may not work if isAlpha() does not see a white space as a character...

thanks javanian

finally resolved it. the issue has nothing to do with isalpha(); after stuffing the net to resolve this ,
i came across another syntax for getting input from the user
"gets()" .i just need to read more on when to use scanf() and gets().
the get() reads white space character in between strings while scanf sees it as a null terminator(from my observation).
or better still you can enlighten me on this if you have an idea.
am beginning to appreciate c++ more cos with "cin()" i wont have this problem.

really appreciate your time

Your welcome, happy you solved it...

Temas: thanks javanian

finally resolved it. the issue has nothing to do with isalpha(); after stuffing the net to resolve this ,
i came across another syntax for getting input from the user
"gets()" .i just need to read more on when to use scanf() and gets().
the get() reads white space character in between strings while scanf sees it as a null terminator(from my observation).
or better still you can enlighten me on this if you have an idea.
am beginning to appreciate c++ more cos with "cin()" i wont have this problem.

really appreciate your time

cin is not a function and whitespace is not a null terminator

lordZOUGA:
cin is not a function and white-space is not a null terminator

hey, i would appreciate when you criticize and give a concrete advise.not criticize to fell like a god
writing "cin" like a function is a typo mistake.
typical nigerian mentality

Temas:

hey, i would appreciate when you criticize and give a concrete advise.not criticize to fell like a god
writing "cin" like a function is a typo mistake.
typical nigerian mentality

I see. cin is still not a function. that you heard it from a nigerian is irrelevant..

@lordZOUGA are you on whatsapp or facebook??

Javanian: @lordZOUGA are you on whatsapp or facebook??

yes, I use both. whatsapp mostly.

Pls Can you P.M your number or email address or both??

Javanian: Pls Can you P.M your number or email address or both??

nairaland has a weird PM system.

Thanks...you can take it off if you wish...

Good for you op,
Javanian
There is nothing like String in C #I know you are into java, i'm just saying

lordZOUGA:
yes, I use both. whatsapp mostly.

I see you are neck deep in C, give a brother some advice. I know the basics but the language is fun

A-ZeD:
Good for you op,
Javanian
There is not like String in C #I know you are into java, i'm just saying

Thanks for the correction...

Javanian:

Thanks for the correction...

You welcome. What are you doing up so late? wanna put me through some java?

my bed time starts around 2 a.m. ...For the java am ready when you are...

Javanian: my bed time starts around 2 a.m. ...For the java am ready when you are...

Ok. Wont hurt to learn something from you. Can i IM you?

No Problem...

give me your favorite IM platform

I use gmail, but just P.M. via Nairaland, we can work from there..

Sent a PM

@javanian, u seem to be a java freak, I hope we could meet online and talk