- (____ / 4 points) Fill in the blank
a) In C++, each statement in the source code ends with a
semicolon (;)
b) What include file is necessary to use to objects
cout and cin?
iostream.h
c) Which of these three operators has the highest
precedence?
+, *, >
times
d) In the last line of the following code, the action
that enables the compiler to perform the multiplication is
called "Type PROMOTION".
int i = 3;
float b = 2.0 * i;
- (____ / 8 points) Short Answer
a) Give three examples of compound statements ("smooth operators"):
++ --
+= -+ *= /= %=
b) Why is the following code invalid?
int a = 5, b = 4, c;
c = ++(--a * b--);
The ++ operator must be applied to an lvalue, such as a variable. It
can't be applied to an arbitrary expression. The expression (--x * y--) does
not have a valid storage location in memory.
c) Explain the difference between int and float.
int - stores integer type numbers
float - stores decimal type numbers
d) Is the following code valid? Why or why not?
Hint: Your answer should contain the word 'operator'.
int a, b = 3, c;
c = a = b;
Valid. The assignment operator, like all operators, is also results in an
expression. The expression (a = b) evaluated to the value assigned, in this
case 3. So the statement c = (a = b) is legal, because (a = b) has a value, 3.
- (____ / 3 points) Give the values of a, b, and x
after the execution of the following code:
int a = 7, b;
float x;
b = ++a - 2;
x = ++a % b--;
x /= 2;
a: (9, int)
b: (5, int)
x: (1.5, float)
- (____ / 5 points) Write a C++ program that inputs a distance in inches
and outputs that distance in yards.
(1 yard = 36 inches)
// Converts feet to miles
#include <iostream.h>
void main () {
cout << "Enter number of feet: ";
int feet;
cin >> feet;
cout << "That would be " << feet / 5280.0 << " miles." << endl;
}
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