$6)$ Write a C program that reads a number from a file named input.txt and prints the number followed by $"$is positive", $"$is negative", or $"$is neutral" depending on the value read in$.$ The program must read as many numbers as there are in the file.

Sample run of the program:

Assuming the content of the input file is: $1-203-4$

The output displayed by the program

$1$ is positive

$-2$ is negative

$0$ is neutral

$3$ is positive

$-4$ is negative