Programming

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

const char e[] = {
	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
	'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
	'Y', 'Z',
	'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
	' '
};
const char *m[] = {
	".- ", "-.. ", "-.- ", "-.. ", ". ", "..-. ", "--. ", "....",
	"..", ".--- ", "-.- ", ".-.. ", "-- ", "-. ", "--- ", ".--. ",
	"--.- ", ".-. ", "... ", "- ", "..- ", "...- ", "...- ",
	".-- ", "-..- ", "-.-- ", "--.. ",
	".---- ", "..--- ", "...-- ", "....- ", "..... ", "-.... ",
	"--... ", "---.. ", "----. ", "----- ",
	"   "
};

void morse(char []);
void unmorse(char []);
void help(char []);

main(int argc, char *argv[]) {
	if (argc < 3 || strstr(argv[1], "-h") != NULL) {
		help(argv[0]);
		exit(1);
	}
	if (strstr(argv[1], "-e") != NULL) {
		morse(argv[2]);
	} else if (strstr(argv[1], "-m") != NULL) {
		unmorse(argv[2]);
	} else {
		fprintf(stderr, "unkown option: %s\n\n", argv[1]);
		help(argv[0]);
		exit(1);
	}
	
}
void morse(char s[]) {
	int i = 0, j;

	while (s[i] != '\0') {
		j = 0;
		while (s[i] != e[j] && s[i] != (e[j] + 'a' - 'A')) {
			j++;
		}
		printf("%s", m[j]);
		i++;
	}
	printf("\n");
}
void unmorse(char s[]) {
	int i = 0, j;

	while (s[i] != '\0') {
		j = 0;
		while (strstr(&s[i], m[j]) != NULL &&
		       strstr(m[j], &s[i]) != NULL) {
			j++;
		}
		printf("%s", e[j]);
		i++;
	}
}
void help(char prog[]) {
	fprintf(stderr, "usage: %s [options] [string]\n"
		"options:\n\t-e\tenglish to morse\n"
		"\t-m\tmorse to english\n\t-h\tprint this\n",
		prog);
}

#include <stdio.h>

char rot(char [], int, int);
char lower(char [], int);

main(int argc, char *argv[]) {
	int i = 0;

	if (argc == 1) {
		fprintf(stderr, "usage: %s [rot] [string]\n", argv[0]);
	}
	while (argv[2][i] != '\0') {
		argv[2][i] = lower(argv[2], i);
		argv[2][i] = rot(argv[2], i, atoi(argv[1]));
		i++;
	}
	printf("%s\n", argv[2]);
}
char lower(char s[], int i) {
	if (s[i] <= 90 && s[i] >= 65)
		s[i] += 32;
	return s[i];
}
char rot(char s[], int i, int rotnum) {
	return (s[i] > 109) ? (s[i] -= rotnum) : (s[i] += rotnum);
}

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

#define CONS 13
#define UPPER 65
#define LOWER 97

void rotate(char, int);

int main() {
  char *str = "zypher";
  int length;
  int i;

  for( length = strlen(str), i=0; i<length; i++ ) {
    if( str[i] >= UPPER && str[i] <= (UPPER + CONS*2 - 1) ) {
      rotate(str[i], UPPER);
    }
    else if( str[i] >= LOWER && str[i] <= (LOWER + CONS*2 - 1) ) {
      rotate(str[i], LOWER);
    }
  }
  return 0;
}

void rotate(char ch, int start) {
  (ch + CONS) > (start + CONS*2 - 1) ?  printf("%c\n", ( ch + CONS ) - ( (start + CONS*2 - 1) + 1 ) + start) : printf("%c\n", ch + CONS);
}

#!/usr/bin/awk
# Function: convert between morse and english
# Limitations: Many !!
BEGIN{
          morse["A"]=".-"   ; morse["B"]="-..."
          morse["C"]="-.-." ; morse["D"]="-.."
          morse["E"]="."    ; morse["F"]="..-."
          morse["G"]="--."  ; morse["H"]="...." 
          morse["I"]=".."   ; morse["J"]=".---"
          morse["K"]="-.-"  ; morse["L"]=".-.." 
          morse["M"]="--"   ; morse["N"]="-."
          morse["O"]="---"  ; morse["P"]=".--."
          morse["Q"]="--.-" ; morse["R"]=".-." 
          morse["S"]="..."  ; morse["T"]="-"
          morse["U"]="..-"  ; morse["V"]="...-"
          morse["W"]=".--"  ; morse["X"]="-..-" 
          morse["Y"]="-.--" ; morse["Z"]="--.." 
          morse["0"]="-----"; morse["1"]=".----"
          morse["2"]="..---"; morse["3"]=""
          morse["4"]="....-"; morse["5"]="....."
          morse["6"]="-...."; morse["7"]="--..."
          morse["8"]="---.."; morse["9"]="----."          
          while (1){
             print "1) English to Morse."
             print "2) Morse to English."
             print "3) Exit."
             printf "Enter choice: "
             getline which
             if (which==3) { exit }
             if (which==1 ){
                 printf "Enter letters to convert: "
                 getline choice
                 n=split(choice,arr,"")          
                 for(i=1;i<=n;i++) {
                     arr[i]=toupper(arr[i])
                     printf morse[arr[i]]              
                 }
                 print     
              }
              else if (which==2){
                  printf "Enter morse to convert: "
                  getline morsecode
                  for ( i in morse) {                       
                       if ( morse[i]==morsecode) {
                           print i
                       }
                  }
              
               }
             
             
             }
          

}