#include <stdio.h>

double main(void)
{
	double mark
	printf("Please enter mark:\n");
	
	mark = scanf("%lf");

	if (50 <= mark <= 100)
		printf("Pass\n");

	elseif (mark =0)
		printf("Fail\n");

		else
		{
			printf("Invalid entry\n");
		}return (0.0)
)