In this Lab, you will practise:
if statements You need to know the syntax used to read numerical values with scanf and write numerical values with printf. You should also be familiar with the syntax of if statements.
You should also have read the lab assessment guidelines.
Create a new directory for this lab called lab02 by typing:
mkdir lab02Change to this directory by typing:
cd lab02
prism.c that computes the volume of a rectangular prism.
It should prompt the user to enter the three integers, the side lengths of a rectangular prism.
The program should print out the three numbers entered as well as the volume, surface area and total edge length of the rectangular prism.
Here's what the input and output of your program must look like when it is finished.
Our testing programs will be checking that your output matches exactly (don't panic).
./prism Please enter prism length: 3 Please enter prism width: 4 Please enter prism height: 5 A prism with sides 3 4 5 has: Volume = 60 Area = 94 Edge length = 48
gedit to create a new file named prism.c, don't forget the &.
gedit prism.c &You can start by cut-and-pasting the code from a C program from lecture like this sum2c.c.
Use only int variables.
Don't forget to add comments in your source code.
You can assume the user will always enter 3 positive integers.
Remember you can compile your program by typing:
dcc prism.c -o prismFix any warnings or errors identified by the compiler.
The COMP1511 class account contains a script that automatically runs your program against some tests.
You can test prism.c like this:
~cs1511/bin/autotest lab02 prism.c Test prism_1 (1 1 1) - passed Test prism_2 (9 10 7) - passed 2 tests passed 0 tests failedDon't be surprised if the
autotest script complains about a small difference
in output.
You might think small differences don't matter but it is common when dealing with computers to need to produce data in a very precise format. Getting autotests right is good practice for this.
You can repeat just a single test by specifying its label. For example:
~cs1511/bin/autotest lab02 prism_1What happens when you type the following numbers as side length into your
prism program?
./prism Please enter prism length: 2000 Please enter prism width: 2000 Please enter prism height: 2000You must be able to explain what happens and why, when your tutor marks your work.
heron.c which reads 3 doubles, the side lengths
a, b and c of a triangle, and computes the area of the triangle using Heron's formula:
area = sqrt(s(s-a)(s-b)(s-c))where s is the "semi-perimeter"
s = (a + b + c)/2.Here's what the input and output of your program must look like when it is finished.
./heron Enter side 1: 0.6 Enter side 2: 0.8 Enter side 3: 1.0 Area = 0.240000 ./heron Enter side 1: 5.31 Enter side 2: 4.2 Enter side 3: 7.77 Area = 10.542172 ./heron Enter side 1: 12.5 Enter side 2: 12.5 Enter side 3: 0.5 Area = 3.124375Not all 3 numbers can be the sides of a triangle (its called the triangle inequality), for example: these 3 numbers
2.0 2.0 5.0 can't be the side of a triangle
You program should print exactly the error message below if the 3 numbers entered can not be a triangle.
./heron Enter side 1: 2.0 Enter side 2: 2.0 Enter side 3: 5.0 Error: triangle inequality violated.
heron.c.
gedit heron.c &This program is similar to
prism.c so cut-and-paste your code from
prism.c to get started.
But note there are some key differences.
prism.c - you should use double variables in heron.c.
scanf format ("%lf" instead of "%d") and the same for printf.
sqrt function from the maths library so you
need to add an extra line after:
#include <stdio.h>
#include <math.h>
You can test heron.c like this:
~cs1511/bin/autotest lab02 heron.c Test heron_1 (3.0 4.0 5.0) - passed Test heron_2 (6.0 10.0 8.0) - passed Test heron_3 (2.5 2.5 1.5) - passed Test heron_4 (42.0 42.0 42.0) - passed Test heron_5 (42.0 2.0 39.0) - passed Test heron_6 (20.0 42.0 20.0) - passed Test heron_7 (39.0 2.0 42.0) - passed
count5.c that converts a small integer to words.
It should prompt the user to enter an integer, reads it from the input and prints out the number in words if it is between 1 and 5, or the messages below otherwise.
Here's what the input and output of your program must look like when it is finished.
dcc -o count5 count5.c ./count5 Please enter an integer :2 You entered two. ./count5 Please enter an integer:5 You entered five. ./count5 Please enter an integer: 0 You entered a number less than one. ./count5 Please enter an integer: 1000 You entered a number greater than five.
if statements and simple comparisons.
Use autotest to help test your program:
~cs1511/bin/autotest lab02 count5.c Test count5_1 (-1) - passed Test count5_2 (0) - passed Test count5_3 (1) - passed Test count5_4 (2) - passed Test count5_5 (5) - passed Test count5_6 (6) - passed Test count5_7 (2000) - passed 7 tests passed 0 tests failedAlso do your own testing!
Write a C program dating_range.c that reads a person's age and calculates
the upper and lower age limits of people they should date according to this rule.
Hint: you'll need to use symmetry to calculate the upper bound.
Hint: you only need to use the int type.
For example:
dcc -o dating_range dating_range.c ./dating_range Enter your age: 18 Your dating range is 16 to 22 years old. ./dating_range Enter your age: 22 Your dating range is 18 to 30 years old. ./dating_range Enter your age: 40 Your dating range is 27 to 66 years old.The above rule implies an empty range for young ages. When the rule produces an empty range program should behave like this:
./dating_range
Enter your age: 12
You are too young to be dating.
Use autotest to help test your program:
~cs1511/bin/autotest lab02 dating_range.c Test dating_range_1 (11) - passed Test dating_range_2 (22) - passed Test dating_range_3 (44) - passed 3 tests passed 0 tests failedAlso do your own testing!
easter.c which allows the user to enter a year,
then calculates the date of Easter Sunday for that year.
Use the formula developed in 1876 by
Samuel Butcher, Bishop of Meath,.
Follow the output format in in the example below exactly:
dcc easter.c -o easter ./easter Enter Year: 2017 Easter is April 16 in 2017. ./easter Enter Year: 2018 Easter is April 1 in 2018. ./easter Enter Year: 2019 Easter is April 21 in 2019.
Make sure every variable is declared.
Make sure every statement ends with a semicolon.
As usual use autotest to help test your program:
~cs1511/bin/autotest lab02 easter.c Test easter_1 (1888) - passed Test easter_2 (1999) - passed Test easter_3 (2015) - passed Test easter_4 (2030) - passed Test easter_5 (2222) - passed 5 tests passed 0 tests failed
lab02 directory):
give cs1511 lab02 prism.c count5.c heron.c dating_range.c easter.cSubmit the challenge exercises only if you attempt them.
If you are working at home, you may find it more convenient to upload your work via give's web interface.
Remember the lab assessment guidelines - if you don't finish the exercises
you can finish them in your own time, submit them
by Monday 11:00am using give and ask your tutor to assess them at the start of
the following lab.
Either or both members of a programming pair can submit the work (make sure each program lists both of you as authors in the header comment).