delay

void delay(unsigned int);

delay function is used to suspend execution of a program for a particular time
the parameter are number of milliseconds ( 1 second = 1000 milliseconds)

#include<stdio.h>
#include<dos.h>
 
int main( void )
{
    printf("This c program quits in 42 seconds.\n");        
    delay(42000);                        
    return 0;
}

  This c program quits in 42 seconds