C Common Library Functions

clrscr() in C

clrscr() is an inbuilt library function which is used to clear the previous output displayed in a screen. clrscr() is defined in #include <conio.h> header file.

clrscr() Function Program

#include <stdio.h> //header file section
#include <conio.h>
int main()
{
printf("Before clrscr");
clrscr();
printf("clrscr() will clear the screen");
return 0;
}

exit() in C

exit() is an inbuilt library function which is used to terimate the program irrespective of the statements followed by it. exit() is defined in #include <stdlib.h> header file.

exit() Function Program

#include <stdio.h> //header file section
#include <stdlib.h>
int main()
{
printf("This statement is before exit(); function ");
exit(0);
printf("It will not display ");
return 0;
}

sleep() in C

sleep() is an inbuilt library function which is used to delay the program's output. sleep() is defined in #include <unistd.h> header file.

sleep() Function Program

#include <stdio.h> 
#include <unistd.h>
int main()
{
printf("Countdown... ");
printf("\n 3");
sleep(1);
printf("\n 2");
sleep(1);
printf("\n 1");
sleep(1);
printf("\n Celebration Time ");
return 0;
}

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