You can find the declarations of

mathematical functions in the header file

<math.h> that you must #include in your program just as you do <stdio.h>. For instance, to use

a function such as pow(),

to get the square of x and

store the result in y,

you will write the following C code:

int
x, y;
x = pow(x, 2);

Now

try to compile the file q5.c as

usual. Do you get an error message that says, "Undefined

reference to pow"? Since we have a math feature in our

program, we need to compile the program slightly differently.

    $gcc q3.c –lm

The

option

Using

this information, write a C program that reads a positive integer and displays

the largest positive integer N for

which the sum 1