Заголовок dos.h на C с примерами

dos.h is a header file of C Language. This library has functions that are used for handling interrupts, producing sound, date and time functions, etc. It is Borland specific and works in compilers like Turbo C Compiler.
Below are the functions supported by this library:

1. delay(): The delay() function in C is used to stop the execution of the program for some period of time.
   Syntax:

   delay(unsigned int)
   

   Parameters: It accepts a time in milliseconds to stop the excution of the program to that period of time.

   Below is the program to illustrate delay():

   // C program to implement delay() #include <dos.h> #include <stdio.h> #include <stdlib.h>    // Driver Code int main() {     printf("Takes 10 sec and exit. ");        // Delay the program execution     // for 1 second     delay(10000);        return 0; }

2. sleep(): The sleep() function in C is used to delay the execution of the program for some period of time.
   Syntax:

   sleep(unsigned seconds)
   

   Parameters: It accepts a time in seconds to delay the excution of the program to that period of time.

   Below is the program to illustrate sleep():

   // C program to implement sleep() #include <dos.h> #include <stdio.h> #include <stdlib.h>    // Driver Code int main() {     printf("Wait 2 sec and exit. ");        // Delay the program execution     // for by 2 seconds     sleep(2);        return 0; }

3. getdate(): The getdate() function in C is used to get the current Date of the system.

   Syntax:

   getdate(struct date d)
   

   Parameters: It accepts a structure date which is defined in dos.h library itself. To print the date it uses function da_day(), da_mon() and da_year().

   Below is the program to illustrate getdate():

   // C program to implement getdate() #include <dos.h> #include <stdio.h> #include <stdlib.h>    // Driver Code int main() {     // Structure of date     struct date a;        // Function call to get the date     // of the system     getdate(&a);        // Print the date, month and year     printf("The Date is: %d/%d/%d ", a.da_day,            a.da_mon,            a.da_year);        return 0; }

4. gettime(): The gettime() function in C is used to get the Time shown by the System.

   Syntax:

   gettime(struct time t)
   

   Parameters: It accepts a structure time which is defined in dos.h library itself. To print the date it uses function ti_hour(), ti_min() and ti_sec().

   Below is the program to illustrate gettime():

   
   
   
   

   // C program to implement gettime() #include <dos.h> #include <stdio.h> #include <stdlib.h>    // Driver Code int main() {     // Structure of time     struct time t;        // Function call to get the time     // of the system     getdate(&t);        // Print the hour, minutes and second     printf("The time is: %d : %d : %d ", x.ti_hour,            x.ti_min,            x.ti_sec);        return 0; }

5. sound(): The sound() function in C is used to play different sound on different frequency on our system.

   Syntax:

   sound(int frequency)
   

   Parameters: It accepts a frequency and play the sound of that frequency in our system.

   Below is the program to illustrate sound():

   // C program to implement sound() #include <dos.h> #include <stdio.h> #include <stdlib.h>    // Driver Code int main() {     // Initialise frequency     int x = 200;        // Loop for playing sound of     // increasing frequency     for (; x < 1000; x++) {            // Function to play sound         sound(x);            delay(25);     }        // To stop the frequency     nosound();     return 0; }

6. nosound(): The nosound() function in C is used to stop the sound played by souns() function.

   Syntax:

   nosound()
   

   Parameters: It doesn’t accepts any parameters.

   Below is the program to illustrate nosound():

   // C program to implement nosound() #include <dos.h> #include <stdio.h> #include <stdlib.h>    // Driver Code int main() {     // Initialise frequency     int x = 200;        // Function call to play sound     // with frequency 200htz     sound(x);        // Delay sound for 1 sec     delay(1000);        // To stop the sound     nosound();     return 0; }

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