/* 
	Program rot_string performs a Caeser Cipher on text read from standard input,
	and writes the ciphertext to standard output. 
*/

#include<stdio.h>
#include<string.h>

int main() {
	int character, rotation, length, i, j;
	char str[256], cipher[256];

	printf("Input a string to rotate.\n");
	fgets(str, sizeof(str), stdin);

	/* get length of string */
	length = strlen(str);

	printf("Input string: %s\n", str);
	printf("Length of string: %d\n", length);

	/* loop through all possible combinations */
	for (i=1; i<=26; i++)
	{
		/* loop through the string */
		for (j=0; j<length; j++)
		{
			character = str[j];
			rotation = i;

			/* if character in A - Z, rotate it */
			if ((character < 91)&&(character > 64)) {
				character = character + rotation;
				if (character > 90) {
					character = character - 26;
				}
			} else {
				/* if character in a - z, rotate it */
				if ((character < 123) && (character > 96)) {
					character = character + rotation;
					if (character > 122) {
						character = character - 26;
					}
				}
			}

			/* send possibly modified character to output */
			cipher[j] = character;
		}

		/* print out the output string */
		printf("For offset %2d, cyphertext is %s", i, cipher);
	
	}


} /* end main */