Program to display characters slowly on the console in C++

The task is to write a C++ program that displays the characters of the given string slowly on the console.

Approach: The given problem can be solved by using the sleep() function in C++.

Header File:

• <windows.h> for windows
• <unistd.h> for Linux

Syntax:

Sleep(time_in_milliseconds) 

Random Function: The rand() function in C++ generates random numbers in the range [0, RAND_MAX]. If the random numbers are generated using the rand() function without first calling srand() the program will create the same sequence of numbers each time it is executed.

Syntax:

rand(void)

Program 1:

Below is the implementation to display characters slowly on the console in C++ using the sleep function:

// C++ program for the above approach

#include <iostream>
#include <string>
#include <windows.h>
using namespace std;

// Driver Code
int main()
{
    // Initialize the string
    string S = "Hello World!";

    // Traverse the given string S
    for (int i = 0; i < S[i]; i++) {

        cout << S[i];

        // Waits for 200 milliseconds
        Sleep(200);
    }

    return 0;
}

Output:

Program 2:

Below is the implementation to display characters slowly on the console in C++ using the sleep function and the random function:

// C++ program for the above approach

#include <iostream>
#include <string>
#include <windows.h>
using namespace std;

// Driver Code
int main()
{
    string S = "Hello World!";

    for (int i = 0; i < S.length(); i++) {
        cout << S[i];

        // random function generates
        // random values
        Sleep(200 + rand() % 200);
    }

    return 0;
}

Output: