#include <stdio.h>

int main(int argc, char *argv[])

{

        FILE *ret;
	ret = fopen("test","r");
	if(ret == (FILE *)0)
	{
		printf("Error opening file.\n");
		return 1;
	}
	else
	{
		printf("File created successfully.\n");
		fclose(ret);
	}

...