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. \(\mathrm{A}\) 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.

Consider the following function definition: double func (double \(x,\) int \(y,\) string name) \\{ / / function body \\} Which of the following is the correct function prototype of the function func? i. double func () ii. double func (double, int, string) iii. double func (double \(x,\) int \(y,\) string name) iv. func (double \(x,\) int \(y,\) string name )

Consider the following functions: int secret (int x) \\{\\[\begin{array}{l}\text { int i }, \quad j ; \\\i=2 * x ; \\\\\text { if }(i>10) \\\\\quad j=x / 2 ;\end{array}\\] else \\[\begin{array}{r}j=x / 3 \\\\\text { return } j-1\end{array}\\]\\}int another (int a, int b) \\{\\[\begin{array}{l}\text { int } i, \quad j ; \\\j=0 ; \\\\\text { for } \quad(i=a ; \quad i<=b ; \quad i++) \\\\\quad j=j+i ;\end{array}\\]return \(j;\)\\[\\}\\]} What is the output of each of the following program segments? Assume that \(x, y,\) and \(k\) are int variables. a. \(\quad x=10\) cout \(<<\) secret \((x)<<\) endl b. \(\quad x=5 ; \quad y=8\) cout \(<<\) another \((x, y)<<\) endl c. \(\quad x=10 ; k=\operatorname{secret}(x)\) cout \(<

Consider the following function prototypes: int test \((\text { int }, \text { char, double, } \operatorname{int})\) double two (double, double) char three (int, int, char, double); Answer the following questions. a. How many parameters does the function test have? What is the type of the function test ? b. How many parameters does function two have? What is the type of function two? c. How many parameters does function three have? What is the type of function three? d. How many actual parameters are needed to call the function test? What is the type of each actual parameter, and in what order should you use these parameters in a call to the function test? e. Write a C++ statement that prints the value returned by the function test with the actual parameters \(5,5,7.3,\) and \(' z^{\prime}\) f. Write a C++ statement that prints the value returned by function two with the actual parameters 17.5 and \(18.3,\) respectively. g. Write a C++ statement that prints the next character returned by function three. (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 secret (int one) \\{ \\[ \begin{array}{l} \text { int i; } \\ \text { int prod = 1 } \\ \text { for }(i=1 ; i<=3 ; i++) \\ \text { prod = prod * one; } \end{array} \\] return prod;} a. What is the output of the following C++ statements? i. cout \(<<\) secret \((5)<<\) endl ii. cout \(<<2 *\) secret \((6)<<\) endl b. What does the function secret do?

Write the definition of a function that takes as input the three numbers. The function returns true if the first number to the power of the second number equals the third number; otherwise, it returns false. (Assume that the three numbers are of type double.)

include using namespace std; int mystery (int \(x, \text { int } y, \text { int } z)\) int main () \\{ cout \(<<\) my… # What is the output of the following program? #include using namespace std; int mystery (int \(x, \text { int } y, \text { int } z)\) int main () \\{ cout \(<<\) mystery \((7,8,3)<<\) endl; cout \(<<\) mystery \((10,5,30)<<\) end 1 ; cout \(<<\) mystery \((9,12,11)<<\) end 1 cout \(<<\) mystery \((5,5,8)<<\) endl cout \(<<\) mystery \((10,10,10)<<\) endl return 0;} int mystery (int \(x,\) int \(y,\) int z) \\{ \\[ \begin{aligned} \text { if }(\mathrm{x}<\mathrm{y}&\& \& \mathrm{x}<\mathrm{z}) \\ \text { return }(\mathrm{y}+\mathrm{z}-\mathrm{x}) \end{aligned} \\] else if \((y

Write the definition of a function that takes as input three numbers and returns the sum of the first two numbers multiplied by the third number. (Assume that the three numbers are of type double.)