How to use delay function in C or C language in hindi by programming desire.You can create any animation using delay function. I'm not able to use the delay function in my programs.I tried including the preprocessor directive 'dos.h'.Do tell me if i need to use any other preprocessor directive.I've posted the errors which i get when i try to compile for your reference. 2-24 C:Dev-Cppbinduration.cpp `delay' undeclared (first use this.

Most C programmers know the sleep() function, which pauses program execution for a given number of seconds. Seconds are a vast chunk of time, especially in a computer where things happen quickly. So a desire exists for a function that delays execution for smaller slices of time. For that duty you’ll need to code your own function, similar to the delay() function I use.
The delay() function is built upon a C library function called clock().

The clock() function returns a time value in clock ticks, which is based on the processor’s speed. The value returned is of the clock_t variable type. You can use subsequent reads of the clock() function to determine elapsed time.

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The following code demonstrates elapsed time as measured by the clock() function:

Here is the sample output I see on my system:

And the clock() function returned 1072. And the clock() function returned 1107.

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Of course, to make the clock() function useful, it helps to know how many clock ticks take place a second. That information is stored in the CLOCKS_PER_SEC constant.

The above code initializes both clock_t variables to the same value at Line 9. Then a while loop spins until the difference between the values is 1. Here’s the output:

It took 999017 ticks to wait one second. This value should be the same as CLOCKS_PER_SEC which is 1000000.

Close enough.

Because the CLOCKS_PER_SECOND value could be different on each computer, you need to do some math to figure out how to concoct a delay() function that works on all platforms. Below you see my solution, which uses a millisecond duration as the argument to delay().

At Line 26, the delay() function calculates the pause value in milliseconds (one thousandth of a second). The clock_t variables now and then are initialized at Line 27. Then the while loop waits until the proper number of milliseconds have passed.

Feel free to use the delay() function in your code when a short pause is required.

Delay in C: delay function is used to suspend execution of a program for a particular time.

Declaration: void delay(unsigned int);

Here unsigned int is the number of milliseconds (remember 1 second = 1000 milliseconds). To use delay function in your program you should include the 'dos.h' header file which is not a part of standard C library.

Delay in C program

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If you don't wish to use delay function then you can use loops to produce delay in a C program.

#include<stdio.h>

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int main()
{
int c, d;
for(c =1; c <=32767; c++)
for(d =1; d <=32767; d++)
{}
return0;
}

We have not written any statement in the loop body. You may write some statements that doesn't affect logic of the program.

C programming code for delay

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#include<stdio.h>

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#include<stdlib.h>

main()
{
printf('This C program will exit in 10 seconds.n');

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delay(10000); Ped-basic software.

return0;
}

This C program exits in ten seconds, after the printf function is executed the program waits for 10000 milliseconds or 10 seconds and then it terminates.

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