On the General server, use vi$/$vim to create a file called circle.c and enter the

following C code:

#include

int main$()$

$\{$

float radius, area;

printf$("$Enter the radius: $")$;

scanf$("\%$f$",$ &radius$)$;

area $=3\mathrm{.}1416*$ radius $*$ radius;

printf$("$Area $=\%$f

$",$ area$)$;

$\}$

Write a macro for the value $3\mathrm{.}1416$ and another macro to calculate the area of a circle

given the radius as a parameter. Copy and paste your code into your submission.

Compile the program with the following:

gcc $-$save$-$temps circle.c

Use the more command to view the file called a$-$circle.i and go the bottom to see what

the preprocessor has done to the code. Copy and paste the code from the end of that

file $($the last $10$ or so lines$)$ into your submission.