# 7.3: Solutions to Exercises

Difficulty Level: At Grade Created by: CK-12

Solution to Exercise 1

' is not equal to '

Solution to Exercise 2

' is positive'

Solution to Exercise 3

b * c

gives

a

value of , and , so this code will print 'Hello world'.

Solution to Exercise 4

The parentheses around the relational expression

a > 0

will not change its validity, so this code will print 'a is positive'.

Solution to Exercise 5

The parentheses in this expression change its meaning completely. First,

a < b

is evaluated, and since it is false for the given values of

a

and

b

,

it evaluates to zero. The zero is then multiplied by

c

,

giving

a

value of zero which is interpreted as false. So this code prints 'Goodbye world'.

Solution to Exercise 6

' and are not equal'

Solution to Exercise 7

This code will generate an error message, since

a = b

assigns the value of

b

to

a

.

To check if

a

and

b

are equal, use

a == b

.

Solution to Exercise 8

Any value that is not zero.

Solution to Exercise 9

Any value greater than or equal to and less than .

Solution to Exercise 10

Any value less than or greater than .

Solution to Exercise 11

Every value of

a

will print 'Hello world'.

Solution to Exercise 12

The following code will provide the desired behavior:

if n >= -0.01 && n <= 0.01
disp('a is very close to zero')
end

Solution to Exercise 13

if n >= 1 && n <= 4
CA = 16.00;
elseif n >= 5 && n <= 24
CA = 14.00;
elseif n >= 25 && n <= 99
CA = 12.70;
else
CA = 11.00;
end

Solution to Exercise 14

This code by BrieAnne Davis:

if n >= 1 && n <= 4; %if n=1 to 4, CA is $16.00 CA=16.00; elseif n >= 5 && n <= 24; %if n=5 to 24, CA is$14.00
CA=14.00;
elseif n >= 25 && n <= 99; %if n=25 to 99, CA is $12.70 CA=12.70; elseif n >= 100; %if n=100 or more, CA is$11.00
CA=11.00;
end %this ends the if statement for CA
if n >= 1 && n <= 9; %if n=1 to 9, CB is $24.64 CB=24.64; elseif n >= 10 && n <= 49; %if n=10 to 49, CB is$24.32
CB=24.32;
elseif n >= 50 && n <= 99; %if n=50 to 99, CB is $24.07 CB=24.07; elseif n >= 100; %if n=100 or more, CB is$23.33
CB=23.33;
end %this ends the if statement for CB
if n >= 1 && n <= 24; %if n=1 to 24, CC is $17.98 CC=17.98; elseif n >= 25 && n <= 49; %if n=25 to 49, CC is$16.78
CC=16.78;
elseif n >= 50; %if n=50 or more, CC is $15.78 CC=15.78; end %this ends the if statement for CC if n >= 1 && n <= 9; %if n=1 to 9, CD is$12.50
CD=12.50;
elseif n >= 10 && n <= 99; %if n=10 to 99, CD is $10.42 CD=10.42; elseif n >= 100; %if n=100 or more, CD is$9.62
CD=9.62;
end %this ends the if statement
CO=45.00;
Cunit = CO + CA + CB + CC + CD;

Solution to Exercise 15

This code was originally written by Bryson Hinton and then modified:

cunit = zeros(1,150);
c0 = 45;
for n=1:150
%compute price for part A
if n >= 1 && n <= 4
ca=16;
elseif n >= 5 && n <= 24
ca=14;
elseif n >= 25 && n <= 99
ca=12.7;
else
ca=11;
end
%compute price for part B
if n >= 1 && n <= 9
cb=24.64;
elseif n >= 10 && n <= 49
cb=24.32;
elseif n >= 50 && n <= 99
cb=24.07;
else
cb=23.33;
end
%compute price for part C
if n >= 1 && n <= 24
cc=17.98;
elseif n >= 25 && n <= 49
cc=16.78;
else
cc=15.78;
end
%compute price for part D
if n >= 1 && n <= 9
cd=12.50;
elseif n >= 10 && n <= 99
cd=10.42;
else
cd=9.62;
end
%sum cost for all parts
cunit(n)= c0 + ca + cb + cc + cd;
end
% Plot cost as a function of n
plot(1:150,cunit);
xlabel('n (units)');
ylabel('cost (dollars)');
title('Cost/unit as a function of number of units');

This code produces the plot in Figure 1

Cost as a function of number of units produced.

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CK.ENG.ENG.SE.1.Engineering-Matlab.7.3