» Decodierungs-Programm

include <stdio.h>
#include <string.h>  // wegen strlen und strcpy
#include <stdlib.h> // wegen EXIT_SUCCESS
 
void decode(char *source, char *target)
{
 int i, j = 0;
 int lge = -1;
 
 lge = strlen(source);
 
 
   for(i = 0; i < lge; i++)
	{
     target[j] = source[i] - 1;
     target[j + 1] = '\0';
     j++;
	}

}

int main(int argc, char **argv)
{
 int i;
 char sourceStorage[2][200] = {0};
 char destinationStorage[2][200] = {0};

 strcpy(sourceStorage[0], "Bssjwbm ; ! Qmbofu ; Sjtb!Dppse ;59023O!27033P! Ujnf ! 23 ; 42 ! Ebuf;!1 5 / 1 7 / 3 1 9 9");
 strcpy(sourceStorage[1], "Ef tujobujpo ; ! " );

 printf("Urspruenglicher Text\n");
  for((i = 0);(i < 2); i++)
   {
    printf("%s\n",sourceStorage[i]);
    decode(sourceStorage[i], destinationStorage[i]);
   }
   
 printf("dekodierter Text\n");
  for((i = 0);(i < 2); i++)
   printf("%s\n",destinationStorage[i]);

 return EXIT_SUCCESS;
}

Urspruenglicher Text
Bssjwbm ; ! Qmbofu ; Sjtb!Dppse ;59023O!27033P! Ujnf ! 23 ; 42 ! Ebuf;!1 5 / 1 7 / 3 1 9 9
Ef tujobujpo ; ! 
dekodierter Text
Arrival: Planet:Risa Coord:48/12N 16/22O Time 12:31 Date: 04.06.2088
Destination: 

Mach mit!