Delay() function in C++
By Ranjeet V
Hello everyone, In this post, we will learn about the delay() function in C++. There can be many instances when we need to create a delay in our programs. C++ provides us with an easy way to do so. We can use a delay() function for this purpose in our code. This function is imported from the “dos.h” header file in C++. We can run the code after a specific time in C++ using delay() function.
delay() function in C++
Now let us understand the syntax for delay() function. It is as follows:
void delay(unsigned int milliseconds);
Explanation:
- Here, void suggests that this function returns nothing.
- ‘delay’ is the function name.
- The function takes one parameter which is unsigned integer.
Create a delay in time in a C++ program
The key point to note here is that this delay() function accepts parameter in milliseconds. That is if we want to create a 1-second delay in our program we have to pass 1000 as a parameter to the function.
Example of delay() in C++
#include<iostream.h>
#include<dos.h> //for delay()
#include<conio.h> //for getch()
int main()
{
clrscr();
int n;
cout<<"Enter the delay (in seconds) you want to make after giving input."<<endl;
cin>>n;
delay(n*1000);
cout<<"This has been printed after "<< n <<" seconds delay";
getch();
return 0;
}OUTPUT:
Enter the delay (in seconds) you want to make after giving input. 5 This has been printed after 5 seconds delay.
How it worked:
As you can see in the program, we are taking input from the user ( To know: Taking only integer input in C++ ) and passing it to the delay function after multiplying it with 1000 to convert the seconds into milliseconds.
“dos.h” header file has been included so that a call to delay() function can be made.
NOTE: Your compiler must have dos.h header file in it.
Thanks, but how can I use this delay function for e.g. 10 nanosecond?
it is converting the milisecond into the seconds but thank you nice it really helped. To everybody who wants to know google is copy and paced.