辅导SOF103程序、C++编程语言辅导

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SOF103 C and C++ Programming
Lab Exercise 2
Variables and Data Types
Part A: Review Questions
1. The three classes of languages discussed in the lecture are high-level language,
______ language and _____ language.
2. The program that translates high-level language programs into machine language are
called _______.
3. Two different types of memory in computer systems are ______ memory and
_______ memory.
4. How many bits does one byte of memory contain? Ans: _______.
5. Give an example of a secondary memory. Ans: __________.
6. C++ programs are normally typed into a computer using an __________ program.
7. Complete the following steps in C++ programming when using an integrated
development software (IDE) software:
8. The first line of every C++ source file is a __________ .
9. The files iostream.h and math.h are examples of ______ files.
10. Every C++ program begins execution at the function ________.
11. The ______ begins the body of every function and the ____ ends the body of every
functions.
12. Every statement ends with a ________ .
C++ code writing/editing
Build/Compile program
compilation
error?
Run/Execute program
No
Yes
2
13. The escape sequence \n represents the _______ character which causes the cursor to
position to the beginning of the next line on the screen,
14. State whether each of the following is true or false.
(a) Comments are used to explain what a program is doing and are ignored by the
compiler. (True/False)
(b) C++ considers the variables number and NUMBER to be identical.
(True/False).
(c) All variables must be declared before they are used. (True/False).
(d) All variables must be given a type when they are declared. (True/False).
(e) The endl manipulator has the same effect as the escape sequence \n.
(True/False)
(f) The statement cin >> x1; means to take in user input at run time and store
the value in variable x1. (True/False).
15. Write a one or more C++ statements to accomplish each of the following:
(a) Declare the variables A, number, totalSum and result to be of type
int in a single line.
(b) Declare a floating-point number val and initialize it with the value 0.99.
(c) Declare the variable my_value of type int, new_number of type
double and my_char of type char.
(d) Read three integers from the keyboard and store them in the variables x, y
and z.
(e) Compute the product of three integers contained in variables x, y, and z
and assign the result to the variable result.
(f) Print “The product is ” followed by the value of the variable result.
(g) Declare a constant FIXED_VALUE and initialize it to 2.39.
16. Indicate which of the following are valid identifier names in C++.
(a) formula1 (b) total output
(c) 12months
(d) %sales (e) week1to7
(f) _num_students
3
Part B: Programming Exercises
Instruction: Complete the following lab programming practices. Refer to Table 1 in Appendix
for C++ arithmetic operators.
1. Write a program that asks the user to enter three integer numbers, obtains the three
numbers from the user, and prints the sum, product and average. An example of the
screen dialogue should appear as follows:
2. Write another program similar to Question 1 but use three floating-point numbers.
Print the sum, product and average.
3. Write a program that reads in the radius of a circle and prints the circle’s diameter,
circumference and area. Use the constant value  = 3.14159.
4. Write a program that calculates the squares and cubes of the numbers from 0 to 5 and
uses the tabs to print the following table of values:
5. Write a program that asks user to enter a character. The program then converts the
character into ASCII value and print the ASCII value to the screen.
6. Write a program that converts a distance in meters to the corresponding English
distance in feet and inches. The conversion factors are:
1 inch = 0.0254 meters
1 foot = 12 inches
7. Write a program that reads in temperature in degrees Celsius and displays the
corresponding temperature in degrees Fahrenheit. The conversion formula is
𝐹 =
9
5
𝐶 + 32
Input three integers: 19 2 10
Sum is 31
Product is 380
Average is 10
Number Square Cube
0 0 0
1 1 1
2 4 8
3 9 27
4 16 64
5 25 125
4
8. Write a program that inputs a five-digit number, separates the number into its individual
digits and prints the digits separated from one another by tabs. Use the integer division
and modulus operators. For example, if the user types in 21903, the program should
print:
Appendix
Table 1: C++ Arithmetic Operations
Mathematical
Symbol
Mathematical
Operation
C++ Symbol Example
(assume a = 4 and b = 2)
+ Addition + ans = a + b; // ans = 6
 Subtraction  ans = a  b; // ans = 2
× Multiplication * ans = a * b; // ans = 8
÷ Division / ans = a / b; // ans = 2
mod Modulus % ans = a % b; // ans = 0
2 1 9 0 3