Wednesday, October 1, 2014

Smallest encryption program in C

<?php
$example = range(0, 9);
foreach ($example as $value)
{
 echo $value;
}
int main(int argc, char** argv)
{   
    // retrieve the first argument passed to the program (action)
    char action = argv[1][0];

    // retrieve the second argument passed to the program (key)
    char* key = argv[2];

    // initialize character position in the key
    int i = 0;

    // initialize the current input character
    int c = 0;

    // loop until we reach the end of input
    while (c != -1){
        // get a character from stdin
        c = getchar();
        if (action == 'E'){
            // encode the current character
            putchar(c + key[i]);
        } else{
            // decode the current character
            putchar(c - key[i]);
        }
        // increment the position in the key string, without overflow
        i = (i + 1) % strlen(key);
    }
}

1 comment:

  1. Write a c program to print Hello world without using any semicolon. I am in learning process so please ans me these questions.

    The Medical Website Design and Markeitng Solutions for General Physicians.

    ReplyDelete