EBK STARTING OUT WITH C++
9th Edition
ISBN: 9780134996066
Author: GADDIS
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 9, Problem 49RQE
Program Plan Intro
Pointer:
Pointer will allow the user to indirectly access and manipulate the variable data contents. A pointer variable will hold the address of the data contents. If an asterisk “*” operator is present before the variable then that variable is referred as pointer variable.
Consider the following statement:
//definition of pointer variable
int *ptrvar;
Here the variable “ptrvar” is defined to a pointer variable of integer data type. So, it can store the address of an integer variable.
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#include
Servo servo;
int const trigPin = 9;
int const echoPin = 8;
#define red 5
#define green 6
void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(red,OUTPUT);
pinMode(green,OUTPUT);
servo.attach(10);
}
void loop()
{
int duration, distance;
digitalWrite(trigPin, HIGH);
digitalWrite(trigPin, LOW);// Measure the pulse input in echo pin
duration = pulseIn(echoPin, HIGH);// Distance is half the duration devided by 29.1 (from datasheet)
distance = (duration/2) / 29.1;// if distance less than 0.5 meter and more than 0 (0 or less means over range)
if (distance = 0)
{
servo.write(60);
digitalWrite(green,HIGH);
digitalWrite(red,LOW);
delay(200);
}
else
{
servo.write(10);
digitalWrite(red,HIGH);
digitalWrite(green,LOW);
delay(80);
}
}
TASK: create a flowchart using this code, showing the input, output and the conditions on the loop. Lastly, the flowchart must return if ever the conditions have met or not
int func(int a, int b)
{
return (a
void
syscall(void)
{
int num;
struct proc *curproc = myproc ();
num = curproc->tf->eax;
if(num > 0 && num tf->eax = syscalls[num]();
} else {
cprintf("%d %s: unknown sys call %d\n",
curproc->pid, curproc->name, num);
curproc->tf->eax = -1;
}
How is the system call number (read into num) first loaded into curproc->tf->eax?
O the kernel copies it there as a result of a preceding call to argint
O the kernel saves all the general purpose registers onto the kernel stack as part of the trap frame, after an interrupt
O it is saved onto the kernel stack by the hardware as part of the int instruction behavior
O the user places the argument to the system call here before calling int
Chapter 9 Solutions
EBK STARTING OUT WITH C++
Ch. 9.5 - Prob. 9.1CPCh. 9.5 - Write the definition statement for a variable...Ch. 9.5 - List three uses of the symbol in C++.Ch. 9.5 - What is the output of the following code? int x =...Ch. 9.5 - Rewrite the following loop so it uses pointer...Ch. 9.5 - Prob. 9.6CPCh. 9.5 - Prob. 9.7CPCh. 9.5 - Is each of the following definitions valid or...Ch. 9.9 - Prob. 9.9CPCh. 9.9 - Give an example of the proper way to call the...
Ch. 9.9 - Complete the following program skeleton. When...Ch. 9.9 - Look at the following array definition: const int...Ch. 9.9 - Assume ip is a pointer to an int. Write a...Ch. 9.9 - Prob. 9.14CPCh. 9.9 - Prob. 9.15CPCh. 9.9 - Prob. 9.16CPCh. 9.9 - Prob. 9.17CPCh. 9 - What does the indirection operator do?Ch. 9 - Look at the following code. int x = 7; int iptr =...Ch. 9 - So far you have learned three different uses for...Ch. 9 - Prob. 4RQECh. 9 - Prob. 5RQECh. 9 - Prob. 6RQECh. 9 - What is the purpose of the new operator?Ch. 9 - What happens when a program uses the new operator...Ch. 9 - Prob. 9RQECh. 9 - Prob. 10RQECh. 9 - Prob. 11RQECh. 9 - Prob. 12RQECh. 9 - Each byte in memory is assigned a unique...Ch. 9 - The _________ operator can be used to determine a...Ch. 9 - Prob. 15RQECh. 9 - The ________ operator can be used to work with the...Ch. 9 - Array names can be used as ________, and vice...Ch. 9 - Prob. 18RQECh. 9 - The ________ operator is used to dynamically...Ch. 9 - Under older compilers, if the new operator cannot...Ch. 9 - Prob. 21RQECh. 9 - When a program is finished with a chunk of...Ch. 9 - You should only use pointers with delete that were...Ch. 9 - Prob. 24RQECh. 9 - Look at the following array definition: int...Ch. 9 - Prob. 26RQECh. 9 - Assume tempNumbers is a pointer that points to a...Ch. 9 - Look at the following function definition: void...Ch. 9 - Prob. 29RQECh. 9 - Prob. 30RQECh. 9 - Prob. 31RQECh. 9 - T F The operator is used to get the address of a...Ch. 9 - T F Pointer variables are designed to hold...Ch. 9 - T F The symbol is called the indirection...Ch. 9 - T F The operator dereferences a pointer.Ch. 9 - T F When the indirection operator is used with a...Ch. 9 - T F Array names cannot be dereferenced with the...Ch. 9 - Prob. 38RQECh. 9 - T F The address operator is not needed to assign...Ch. 9 - T F You can change the address that an array name...Ch. 9 - T F Any mathematical operation, including...Ch. 9 - T F Pointers may be compared using the relational...Ch. 9 - T F When used as function parameters, reference...Ch. 9 - T F The new operator dynamically allocates memory.Ch. 9 - T F A pointer variable that has not been...Ch. 9 - Prob. 46RQECh. 9 - T F In using a pointer with the delete operator,...Ch. 9 - Prob. 48RQECh. 9 - Prob. 49RQECh. 9 - int x, ptr = nullptr; ptr = x;Ch. 9 - Prob. 51RQECh. 9 - Prob. 52RQECh. 9 - Prob. 53RQECh. 9 - float level; int fptr = level;Ch. 9 - Prob. 55RQECh. 9 - Prob. 56RQECh. 9 - Prob. 57RQECh. 9 - Prob. 58RQECh. 9 - int pint = nullptr; pint = new int[100]; //...Ch. 9 - Prob. 60RQECh. 9 - Prob. 61RQECh. 9 - Prob. 62RQECh. 9 - Array Allocator Write a function that dynamically...Ch. 9 - Test Scores #1 Write a program that dynamically...Ch. 9 - Drop Lowest Score Modify Problem 2 above so the...Ch. 9 - Test Scores #2 Modify the program of Programming...Ch. 9 - Prob. 5PCCh. 9 - Case Study Modification #1 Modify Program 9-19...Ch. 9 - Case Study Modification #2 Modify Program 9-19...Ch. 9 - Mode Function In statistics, the mode of a set of...Ch. 9 - Median Function In statistics, when a set of...Ch. 9 - Reverse Array Write a function that accepts an int...Ch. 9 - Array Expander Write a function that accepts an...Ch. 9 - Element Shifter Write a function that accepts an...Ch. 9 - Movie Statistics Write a program that can be used...
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