Chapter 6

Mark the following statements as true or false: a. To use a predefined function in a program, you need to know only the name of the function and how to use it. b. \(A\) value-returning function returns only one value. c. Parameters allow you to use different values each time the function is called. When a return statement executes in a user-defined function, the function immediately exits. e. A value-returning function returns only integer values. I. A function that changes the value of a reference parameter also changes the value of the actual parameter. a. A variable name cannot be passed to a value parameter. h. If a \(\mathrm{C}++\) function does not use parameters, parentheses around the empty parameter list are still required. I. In \(C++,\) the names of the corresponding formal and actual parameters must be the same. I. Whenever the value of a reference parameter changes, the value of the actual parameter changes. k. In \(\mathrm{C}++,\) function definitions can be nested; that is, the definition of one function can be enclosed in the body of another function. I. Using global variables in a program is a better programming style than using local variables, because extra variables can be avoided. m. In a program, global constants are as dangerous as global variables. n. The memory for a static variable remains allocated between function calls.

Consider the following function definition: int func (int \(x,\) double \(y,\) char \(u,\) string name) 1 / / function body \\} Which of the following are correct function prototypes of the function func? a. int func \((x, y, u,\) name) b. int func (int \(s\), double \(k\), char ch, string name); c. int func (int, double, char, string) d. func (int, double, char, string)

include #include using namespace std; int main() { int num1; int num2; cout << "Enter two integers: "; cin >> num1 >>… # Consider the following program: #include #include using namespace std; int main() { int num1; int num2; cout << "Enter two integers: "; cin >> num1 >> num2; cout << endl; if (num1 != 0 && num2 != 0) cout << sqrt(fabs(num1 + num2 + 0.0)) << endl; else if (num1 != 0) cout << floor(num1 + 0.0) << endl; else if (num2 != 0) cout << ceil(num2 + 0.0) << endl; else cout << 0 << endl; return 0; } a. What is the output if the input is \(124 ?\) b. What is the output if the input is \(327 ?\) c. What is the output if the input is 250 ? d. What is the output if the input is \(049 ?\)

Consider the following statements: int num1, num2, num3; double length, width, height; double volume; num1 = 6; num2 = 7; num3 = 4; length = 6.2; width = 2.3; height = 3.4 and the function prototype: double box(double, double, double); Which of the following statements are valid? If they are invalid, explain why. a. volume = box(length, width, height); b. volume = box(length, 3.8, height); c. cout << box(num1, num3, num2) << endl; d. cout << box(length, width, 7.0) << endl; e. volume = box(length, num1, height); f. cout << box(6.2, , height) << endl; g. volume = box(length + width, height); h. volume = box(num1, num2 + num3);

Consider the following functions: int find(int num) { int first, second; first = num * num; second = first + num; if (second > 100) num = first / 10; else num = first / 20; return num + 2; } int discover(int one, int two) { int secret = 0; for (int i = one; i < two; i++) secret = secret + i * i; return secret; } What is the output of each of the following program segments? a. cout << find(15) << endl; b. cout << discover(3, 9) << endl; c. cout << find(10) << " " << discover(10, find(10)) << endl; d. x = 12; y = 8; cout << discover(y, x) << endl;

Consider the following function prototypes: int func1(int, double); double func2(string, int, double); char func3(int, int, double, char); string join(string, string); Answer the following questions: a. How many parameters does the function func1 have? What is the type of the function func1? b. How many parameters does function func2 have? What is the type of function func2? c. How many parameters does function func3 have? What is the type of function func3? d. How many parameters does function join have? What is the type of function join? e. How many actual parameters are needed to call the function func1? What is the type of each actual parameter, and in what order should you use these parameters in a call to the function func1? f. Write a C++ statement that prints the value returned by the function func1 with the actual parameters 3 and 8.5. g. Write a C++ statement that prints the value returned by function join with the actual parameters "John" and "Project Manager", respectively. h. Write a C++ statement that prints the next character returned by function func3. (Use your own actual parameters.)

Why do you need to include function prototypes in a program that contains user-defined functions?

Write the definition of a function that takes as input a char value and returns true if the character is uppercase; otherwise, it returns false.

Consider the following function: int mystery(int x, double y, char ch) { if (x == 0 && ch > 'A') return(static_cast(pow(y, 2)) + static_cast(ch)); else if (x > 0) return(x + static_cast(sqrt(y)) - static_cast(ch)); else return(2 * x + static_cast(y) - static_cast(ch)); } What is the output of the following C++ statements? a. cout << mystery(0, 6.5, 'K') << endl; b. cout << mystery(4, 16.0, '#') << endl; c. cout << 2 * mystery(-11, 13.8, '8') << endl;

Consider the following function: int secret(int m, int n) { int temp = 0; for (int i = 1; i < abs(n); i++) temp = temp + i * m; return temp; } a. What is the output of the following C++ statements? i. cout << secret(3, 6) << endl; ii. cout << secret(5, -4) << endl; b. What does the function secret do?