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dos.h header in C with examples
  • Last Updated : 13 Oct, 2020

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.\n");
      
        // 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.\n");
      
        // 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\n", 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\n", 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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