Lecture 4 Tao Wang 1

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1 Lecture 4 Tao Wang 1

2 Objectives In this chapter, you will learn about: Assignment operations Formatting numbers for program output Using mathematical library functions Symbolic constants Common programming errors C++ for Engineers and Scientists, Third Edition 2

3 Assignment Operations Assignment Statement: Assigns the value of the expression on the right side of the = to the variable on the left side of the = Another assignment statement using the same variable will overwrite the previous value with the new value Examples: slope = 3.7; slope = 6.28; C++ for Engineers and Scientists, Third Edition 3

4 Assignment Operations (continued) Right side of an assignment statement may contain any expression that can be evaluated to a value Examples: newtotal = total; taxes =.06*amount; average = sum / items; Only one variable can be on the left side of an assignment statement C++ for Engineers and Scientists, Third Edition 4

5 Assignment Operations (continued) C++ for Engineers and Scientists, Third Edition 5

6 Assignment Operations (continued) Assignment operator: The = sign C++ statement: Any expression terminated by a semicolon Multiple assignments in the same expression are possible Example: a = b = c = 25; C++ for Engineers and Scientists, Third Edition 6

7 Assignment Operations (continued) Coercion: Forcing a data value to another data type Value of the expression on the right side of an assignment statement will be coerced (converted) to the data type of the variable on the left side during evaluation Variable on the left side may also be used on the right side of an assignment statement C++ for Engineers and Scientists, Third Edition 7

8 Assignment Operations (continued) C++ for Engineers and Scientists, Third Edition 8

9 Assignment Operations (continued) Accumulation statement: Has the effect of accumulating, or totaling Syntax: variable = variable + newvalue; C++ for Engineers and Scientists, Third Edition 9

10 Assignment Operations (continued) Additional assignment operators provide short cuts: +=, -=, *=, /=, %= Example: sum = sum + 10; is equivalent to: sum += 10; price *= rate +1; is equivalent to: price = price * (rate + 1); C++ for Engineers and Scientists, Third Edition 10

11 Assignment Operations (continued) C++ for Engineers and Scientists, Third Edition 11

12 Assignment Operations (continued) Counting statement: Adds a fixed value to the variable s current value Syntax: variable = variable + fixednumber; Example: i = i + 1; count = count + 1; C++ for Engineers and Scientists, Third Edition 12

13 Assignment Operations (continued) Increment operator ++: Unary operator for the special case when a variable is increased by 1 Prefix increment operator appears before the variable Example: ++i Postfix increment operator appears after the variable Example: i++ C++ for Engineers and Scientists, Third Edition 13

14 Assignment Operations (continued) Example: k = ++n; //prefix increment is equivalent to: n = n + 1; //increment n first k = n; //assign n s value to k Example: k = n++; //postfix increment is equivalent to k = n; n = n + 1; //assign n s value to k //and then increment n C++ for Engineers and Scientists, Third Edition 14

15 Assignment Operations (continued) Decrement operator --: Unary operator for the special case when a variable is decreased by 1 Prefix decrement operator appears before the variable Example: --i; Postfix decrement operator appears after the variable Example: i--; C++ for Engineers and Scientists, Third Edition 15

16 Formatting Numbers for Program Output Proper output formatting contributes to ease of use and user satisfaction cout with stream manipulators can control output formatting C++ for Engineers and Scientists, Third Edition 16

17 Formatting Numbers for Program Output (continued) Table 3.1 Commonly Used Stream Manipulators C++ for Engineers and Scientists, Third Edition 17

18 Formatting Numbers for Program Output (continued) Table 3.1 Commonly Used Stream Manipulators (continued) C++ for Engineers and Scientists, Third Edition 18

19 Formatting Numbers for Program Output (continued) C++ for Engineers and Scientists, Third Edition 19

20 Formatting Numbers for Program Output (continued) The field width manipulator must be included for each value in the data stream sent to cout Other manipulators remain in effect until they are changed iomanip header file must be included to use manipulators requiring arguments C++ for Engineers and Scientists, Third Edition 20

21 Formatting Numbers for Program Output (continued) Formatting floating-point numbers requires three field-width manipulators to: Set the total width of the display Force a decimal place Set the number of significant digits after the decimal point Example: cout << " " << setw(10) << fixed << setprecision(3) << << " "; produces this output: C++ for Engineers and Scientists, Third Edition 21

22 Formatting Numbers for Program Output (continued) setprecision: Sets number of digits after decimal point if a decimal point has been explicitly forced; otherwise, it sets the total number of displayed digits If the field width is too small, cout ignores the setw manipulator setting and allocates enough space for printing If setprecision setting is too small, the fractional part of the value is rounded to the specified number of decimal places C++ for Engineers and Scientists, Third Edition 22

23 Formatting Numbers for Program Output (continued) If setprecision value is too large, the fractional value is displayed with its current size C++ for Engineers and Scientists, Third Edition 23

24 Formatting Numbers for Program Output (continued) Table 3.2 Effect of Format Manipulators C++ for Engineers and Scientists, Third Edition 24

25 Formatting Numbers for Program Output (continued) Table 3.2 Effect of Format Manipulators (continued) C++ for Engineers and Scientists, Third Edition 25

26 Formatting Numbers for Program Output (continued) setiosflags manipulator: Allows additional formatting: Right or left justification Fixed display with 6 decimal places Scientific notation with exponential display Display of a leading + sign Parameterized manipulator: One which requires arguments, or parameters C++ for Engineers and Scientists, Third Edition 26

27 Formatting Numbers for Program Output (continued) Table 3.3 Format Flags for Use with setiosflags() C++ for Engineers and Scientists, Third Edition 27

28 Formatting Numbers for Program Output (continued) C++ for Engineers and Scientists, Third Edition 28

29 Formatting Numbers for Program Output (continued) To designate an octal integer constant, use a leading zero To designate a hexadecimal integer constant, use a leading 0x Manipulators affect only output; the value stored internally does not change C++ for Engineers and Scientists, Third Edition 29

30 Formatting Numbers for Program Output (continued) C++ for Engineers and Scientists, Third Edition 30

31 Formatting Numbers for Program Output (continued) Manipulators can also be set using the ostream class methods Separate the cout object name from the method name with a period Example: cout.precision(2) C++ for Engineers and Scientists, Third Edition 31

32 Formatting Numbers for Program Output (continued) Table 3.4 ostream Class Functions C++ for Engineers and Scientists, Third Edition 32

33 Using Mathematical Library Functions C++ has preprogrammed mathematical functions that can be included in a program You must include the cmath header file: #include <cmath> Math functions require one or more arguments as input, but will return only one value All functions are overloaded, and can be used with integer and real arguments C++ for Engineers and Scientists, Third Edition 33

34 Using Mathematical Library Functions (continued) Table 3.5 Common C++ Functions C++ for Engineers and Scientists, Third Edition 34

35 Using Mathematical Library Functions (continued) To use a math function, give its name and pass the input arguments within parentheses Expressions that can be evaluated to a value can be passed as arguments Figure 3.10 Using and passing data to a function C++ for Engineers and Scientists, Third Edition 35

36 Using Mathematical Library Functions (continued) Determine the time it takes a ball to hit the ground after it has been dropped from an 800-foot tower C++ for Engineers and Scientists, Third Edition 36

37 Using Mathematical Library Functions (continued) Function calls can be nested Example: sqrt(sin(abs(theta))) Cast operator: A unary operator that forces the data to the desired data type Compile-time cast Syntax: datatype (expression) Example: int(a+b) C++ for Engineers and Scientists, Third Edition 37

38 Using Mathematical Library Functions (continued) Run-time cast: The requested conversion is checked at run time and applied if valid Syntax: staticcast<data-type> (expression) Example: staticcast<int>(a*b) C++ for Engineers and Scientists, Third Edition 38

39 Symbolic Constants Symbolic constant: Constant value that is declared with an identifier using the const keyword A constant s value may not be changed Example: const int MAXNUM = 100; Good programming places statements in appropriate order C++ for Engineers and Scientists, Third Edition 39

40 Symbolic Constants (continued) Proper placement of statements: preprocessor directives int main() { symbolic constants main function declarations } other executable statements return value C++ for Engineers and Scientists, Third Edition 40

41 A Closer Look: Programming Errors Program errors may be detected in four ways: Before a program is compiled (desk checking) While it is being compiled (compile-time errors) While it is being run (run-time errors) While examining the output after completion Errors may be: Typos in the source code Logic errors C++ for Engineers and Scientists, Third Edition 41

42 A Closer Look: Programming Errors (continued) Logic errors: Often difficult to detect and difficult to find the source Program tracing: Stepping through the program by hand or with a trace tool Debugger: Program that allows the interruption of a running program to determine values of its variables at any point C++ for Engineers and Scientists, Third Edition 42

43 Common Programming Errors Failure to declare or initialize variables before use Failure to include the preprocessor statement when using a C++ preprogrammed library Passing the incorrect number or type of arguments to a function Applying increment or decrement operator to an expression instead of an individual variable C++ for Engineers and Scientists, Third Edition 43

44 Common Programming Errors (continued) Failure to separate all variables passed to cin with the extraction symbol >> Failure to test thoroughly Compiler-dependent evaluation when increment or decrement operators are used with variables that appear more than once in the same expression C++ for Engineers and Scientists, Third Edition 44

45 Case Study The number of bacteria, B, in a culture that's subject to refrigeration can be appromimated by this formula: B = *e^(-0.032*t) e is Euler's number t is the time in hours the culture has been refrigerated Use the above formula write a program that determine the number of bacteria (in 4 precisions) in the culture after N hours, which N is from input C++ for Engineers and Scientists, Third Edition 45

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