|
ECS
30B |
Homework #3 |
Winter 2009 |
Due: Monday,
Jan 26.
All: 11:59pm
using handin to cs30b, p3 directory.
Filenames: car.c,
projectile.c,
round.c biggest.c
Programming:
All programs should be able to compile with no warnings when compiled
with the
–Wall option. You should put your name(s) in a comment on the first
line of
each file. The prompts and output format
of each program must match the following examples exactly.
The actual values calculated by the programs
may vary slightly from the examples. To
use functions from math.h, you must have –lm on your compile line (that
is an
“l” as in library) to link with the math library, e.g., gcc –Wall –lm
car.c.
#1. (p. 140) Filename: car.c. Use the math function pow
[…@pc…]$ car.out
Please enter the
principal,
and interest> 10000 18
Please enter the
number of
payments> 36
Your loan of
$10000.00 will
have monthly payments of $361.52.
[…@pc…]$
#4 (p. 141) Filename: projectile.c.
Your
code must include a function named display_instructions which simply
displays the instructions (first para below). Think: what are the
arguments to this function? What is the return type? Writing it should
be easy--it's just printing stuff.
[…@pc…]$
projectile.out
This program
computes the
duration of a projectile's flight,
and its height
above the
ground when it reaches the target.
The program will
ask you for
the angle of elevation (in radians),
the distance to
the target
(in feet), and the project velocity
(in feet per
second).
Please enter the
angle,
distance, velocity> 0.3 11000 800
The projectile
will take
14.393 seconds to reach the target.
The projectile
will hit the
target at a height of 70.6 feet.
[…@pc…]$
#5 ( p. 142) Filename: round.c (TRICKY!)
This can be done without calling any functions.
[…@pc…]$ round.out
Please enter a
positive
number> 32.4851
That rounded is
32.4900
[…@pc…]$
Last: Given 3 numbers, find the
biggest. FUN problem---try to minimize the number of comparisons, and
not repeat comparison.
Hint: Use an extra variable to
store partial results :-)
./biggest.out
Please enter 3 numbers separated by spaces > 30 10 70
70 is the biggest