Random and replacement characters in c++ output - c++

Question

I am writing a program to reverse a string and insert random characters in between.
Here is my code:
main.cpp
#include <iostream>
#include <chrono>
#include <thread>
#include "encrypter.cpp"
using namespace std;
int main(int argc, char *argv[])
{
char message[256];
this_thread::sleep_for(chrono::milliseconds(1000));
cout << "Make sure theres no one around you" << endl;
this_thread::sleep_for(chrono::milliseconds(1000));
cout << "Enter secret message ";
cin.get(message, 256);
cout << "message encrypted" << endl;
enc(message);
return 0;
}
encrypter.cpp
#include <iostream>
#include <string>
int getRandom(int a, int b) {
return a + (rand() % static_cast<int>(b - a + 1));
}
using namespace std;
void enc(char message[256]) {
int i = 0;
int len = strlen(message);
int revlen = len - 1;
int wtpselector;
int charselector;
int encsim;
char randchar[6] = "##$%&";
char strreved[256];
char strenc[1024];
while (i < len) {
strreved[revlen] = message[i];
i++;
revlen--;
}
revlen = strlen(strreved);
len = revlen - 1;
i = 0;
encsim = 0;
while (i < revlen) {
wtpselector = getRandom(0, 4);
charselector = getRandom(0, 4);
if (wtpselector == 0) {
strenc[encsim] = strreved[i];
i++;
encsim++;
} else {
strenc[encsim] = randchar[charselector];
encsim++;
}
}
cout << strenc << endl;
}
But the output has many random characters that are not supposed to be there and are not in the program.
Like:
Input: hello world
Output: $%#$#&&d&&#%$%1%row &#$$#%&ol#%##%&1%&#$&#ehe$%%€##8#&%#$#& #%##%&¢&#%#&#$##$#%%##&%##&#&$8%#$###$#$##%&&#&##Q#$$#&¢%#% Q#\#&$##{&&&&$#¢ \ $$$$######&&&%%&&%{ $#¢v#&#&~u####%&%¢
Please help!!!

Answer 1

You have missed two important things:
when you declare an array it's values are not defined (whatever is in memory)
strlen counts to the first occurance of '\0' character
In order for your code to work you must initialize char arrays, which means change those two lines:
char strreved[256];
char strenc[1024];
to:
char strreved[256] = {0};
char strenc[1024] = {0};