dos.h header in C with examples

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:

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 execution 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;
}

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 execution 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;
}

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;
}

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;
}

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;
}

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;
}

dos.h header in C with examples

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