Write a C program that catches the ctrl-c (SIGINT) signal for the first time and display the appropriate message and exits on pressing ctrl-c again.

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
void sigfun(int sig)
{
printf("You have presses Ctrl-C , please press again to exit");
(void) signal(SIGINT, SIG_DFL);
}
int main()
{
(void) signal(SIGINT, sigfun);
while(1) {
printf("Hello World!
");
sleep(1);
}
return(0);
}