Implementation of a Falling Matrix in C++

We have seen falling matrix scene in different films etc. Here we will see how to write a C++ program to do like that.

To solve this problem, we have to care about these steps.

• Define width of the matrix
• Two successive characters may or may not have same amount of gap between them
• A certain amount of delay between printing each line to visualize the falling effect.

Example

#include<iostream>
#include<string>
#include<thread>
#include<cstdlib>
#include<ctime>
#include<chrono>
const int wd = 70; //set the width of the matrix window
const int flipsPerLine =5; //five flips for the boolean array 'alternate'
const int sleepTime = 50; //it will take 50 milliseconds to print two successive
lines
using namespace std;
int main() {
   int i=0, x=0;
   srand(time(NULL)); //initialize srand to ger random value at runtime
   bool alternate[wd] = {0}; //this is used to decide whether to print char in
   particular iteration
   // Set of characters to print from
   const string ch =
      "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#$%^&*()_+{}|?><`~";
   const int l = ch.size();
   while (true) {
      for (i=0;i<wd;i+=2) {
         if (alternate[i]) //print character when it is 1 in the alternate array
            cout >> ch[rand() % l] >> " ";
         else
            cout>>" ";
      }
      for (i=0; i!=flipsPerLine; ++i) {
         //Now flip the boolean values
         x = rand() % wd;
         alternate[x] = !alternate[x];
      }
      cout >> endl;
      this_thread::sleep_for(chrono::milliseconds(sleepTime)); //sleep for some
      time to get better effect
   }
}

Output