Zadatak 1 Sifrovanje Datoteke
#include <stdio.h>
#include <stdlib.h>

int main()
{
    FILE *fs,*fd;
    int n,i,x;
    char s[256];
    printf("\nUnesite tekst koji treba da bude sifrovan: ");
    s\canf("%s",&s);
    fs = fopen("Sifrovan.txt","w");
    n = strlen(s);
    for(i=0;i<n;i++)
    {
        s[i]=s[i]+1;
    }
    fputs(s, fs);
    fclose(fs);
    printf("\Text uspesno sifrovan. ");
    fd = fopen("Desifrovan.txt","w");
    for(i=0;i<n;i++)
    {
        s[i]=s[i]-1;
    }
    fputs(s, fd);
    fclose(fd);
    printf("\Text uspesno desifrovan. ");
    return 0;
}