Caesar Shift Cipher: read in a STREAM of text, (not just a line, a stream of arbitrary length) and shift the letters in a secret message forward in the alphabet a certain number of places. Example: shift 13 Hello, Jack Uryyb, Wnpx READ THE COMMAND LINE FOR AN INTEGER IN ARGV[1] Run it through atoi() to convert the command line string to an integer: int shift = atoi(argv[1]) ; Remember that if you shift a letter off the end of the alphabet, we must "wrap around" so we come back in down by 'a'. Here's the pseudocode: read in a character c if (c is a letter ) { make c lowercase make c a number between 0 and 25 add the shift value to c mod c so it's between 0 and 25 again add a 'a' to c so it's a real ASCII letter again. } print c on the output // this happens for ALL input, not just letters! 

This is what I have so far:

#include

#include

#include

using namespace std;

int main(int argc, char *argv[])

{

int c;

int shift = atoi(argv[1]);

c=cin.get();

while (!cin.eof())

{

if (isalpha(c))

{

c=(c);

c=c- 'a';

c+= shift;

c%=26;

c+='a';

}

cout.put(c);

c=cin.get();

}

return 0;

}