dos.h header in C with examples
Last Updated :
20 Jul, 2021
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():
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf ( "Takes 10 sec and exit.\n" );
delay(10000);
return 0;
}
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- 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():
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf ( "Wait 2 sec and exit.\n" );
sleep(2);
return 0;
}
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- 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():
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
struct date a;
getdate(&a);
printf ( "The Date is: %d/%d/%d\n" , a.da_day,
a.da_mon,
a.da_year);
return 0;
}
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- 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():
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
struct time t;
getdate(&t);
printf ( "The time is: %d : %d : %d\n" , x.ti_hour,
x.ti_min,
x.ti_sec);
return 0;
}
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- 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():
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
int x = 200;
for (; x < 1000; x++) {
sound(x);
delay(25);
}
nosound();
return 0;
}
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- 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():
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
int x = 200;
sound(x);
delay(1000);
nosound();
return 0;
}
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