See Announcements link in Canvas to keep up with what is going on. Here are a few for review:
Appeal must included citations to sources of information that document or support an alternative answer. Teams may access reference materials during the appeal.
Appeal must include an appropriate rewrite of questions or answers that you interpret as ambiguous or confusing.
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#include <iostream>
using namespace std;
int mystery(int param) {
cout << "param=" << param << endl;
param = param * 2;
return param;
}
int main() {
int num = 2;
cout << "At first, num=" << num << endl;
int result = mystery(num);
cout << "After calling, num=" << num << endl;
cout << "And result=" << result << endl;
return 0;
}
|
&) between the parameter's type and name
parameterType& parameterName
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#include <iostream>
using namespace std;
int mystery(int& param) {
cout << "param=" << param << endl;
param = param * 2;
return param;
}
int main() {
int num = 2;
cout << "At first, num=" << num << endl;
int result = mystery(num);
cout << "After calling, num=" << num << endl;
cout << "And result=" << result << endl;
return 0;
}
|
fillCup(), the contents of the cup in the calling function is different
void mixedCall(int& par1, int par2, double& par3);
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If so, list the CA numbers in Chat
In this exercise we explore how call-by-reference parameters differ from call-by-value parameters.
For this exercise we break into teams. Within the team, work with each other to develop a solution. When the team has finished, choose one member to show your solution to the class by sharing your screen. The instructor will ask one team to share their solution.
#include <iostream>
using namespace std;
void swap(int var1, int var2);
int main() {
int num1 = 0, num2 = 0;
cout << "Enter two integers: ";
cin >> num1 >> num2;
swap(num1, num2);
cout << "After calling function: "
<< num1 << " " << num2 << endl;
return 0;
}
void swap(int var1, int var2) {
int temp = var1;
var1 = var2;
var2 = temp;
}
When you run the program, the output should look like:
Enter two integers: 1 2 After calling function: 1 2
Notice that num1 and num2 have the same values before and after calling the function swap(). Any value assigned to var1 and var2 has no effect on num1 and num2. For more information, see section: 8.3.1: Parameter Passing and Value Parameters.
The ampersands tell C++ to use call-by-reference when passing parameter values.
Enter two integers: 1 2 After calling function: 2 1
Notice that num1 and num2 have different values before and after calling the function swap(). Any value assigned to var1 and var2 change num1 and num2 respectively. For more information, see section: 8.3.2: Using Reference Parameters.
swap.cpp", and submit the file to Canvas with the rest of the exercise files for the week.When finished developing your code click here
to verify. Code need not look exactly the same. After you have completed your own program, reviewing another is often helpful in learning how to improve your programming skills.
print() function
#include <iostream>
#include <vector>
using namespace std;
/**
Prints all the elements in a vector to the console.
@param data the vector to print.
*/
void print(vector<int> data) {
for (unsigned i = 0; i < data.size(); i++) {
cout << data.at(i) << " ";
}
cout << endl;
}
int main() {
const int SIZE = 20;
const int MAX_NUM = 100;
srand(time(0));
vector<int> test(SIZE);
for (unsigned i = 0; i < test.size(); i++) {
test.at(i) = 1 + rand() % MAX_NUM;
}
print(test);
return 0;
}
int find(const vector<int>& data, int item) {
for (unsigned i = 0; i < data.size(); i++) {
if (item == data.at(i)) {
return i;
}
}
return -1;
}
void erase(vector<int>& data, int pos) {
for (unsigned i = pos; i < data.size() - 1; i++) {
data.at(i) = data[i+1];
}
data.pop_back();
}
push_back() function of the vector:
data.push_back(item);
void insert(vector<int>& data, int pos, int value) {
int last = data.size() - 1;
data.push_back(data.at(last));
for (int i = last; i > pos; i--) {
data.at(i) = data.at(i - 1);
}
data.at(pos) = value;
}
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In this exercise we explore how to code vector algorithms.
Remember to verify your code by compiling after each step.
For this exercise we break into teams. Within the team, work with each other to develop a solution. When the team has finished, choose one member to show your solution to the class by sharing your screen. The instructor will ask one team to share their solution.
Vector Algorithms Vector data: 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 0 Goodbye!
Notice the menu provided and how the menu is implemented in code with a loop and if-statements. When entering a 0, as shown in aqua italics above (for emphasis), the program should exit.
print() function to the starter code after main().
void print(vector<int> data) {
for (unsigned i = 0; i < data.size(); i++) {
cout << data.at(i) << " ";
}
cout << endl;
}
print() in the main() function and then compile and run your program to test the changes you made. When run you should see output like:
Vector Algorithms Vector data: 5 7 4 2 8 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 0 Goodbye!
Notice the list of numbers printed, which are the numbers stored in the vector.
find() function to the starter code:
int find(const vector<int>& data, int item) {
for (unsigned i = 0; i < data.size(); i++) {
if (item == data.at(i)) {
return i;
}
}
return -1;
}
find() in the main() function and then compile and run your program to test the changes you made. When run you should see output like:
Vector Algorithms Vector data: 5 7 4 2 8 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 1 Enter the number to find: 8 Found 8 at position 4. Vector data: 5 7 4 2 8 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 0 Goodbye!
Notice the position number (index) returned by the find() function.
erase() function which deletes an element while maintaining order.
void erase(vector<int>& data, int pos) {
for (unsigned i = pos; i < data.size() - 1; i++) {
data.at(i) = data[i+1];
}
data.pop_back();
}
erase() in the main() function and then compile and run your program to test the changes you made. When run you should see output like:
Vector Algorithms Vector data: 5 7 4 2 8 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 2 Position to remove value: 2 Vector data: 5 7 2 8 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 0 Goodbye!
Notice the number for the position (index) is now gone. In our example, the number 4 is gone from position 2.
insert() function which inserts an element into the vector while maintaining order.
void insert(vector<int>& data, int pos, int value) {
int last = data.size() - 1;
data.push_back(data.at(last));
for (int i = last; i > pos; i--) {
data.at(i) = data.at(i - 1);
}
data.at(pos) = value;
}
insert() in the main() function and then compile and run your program to test the changes you made. When run you should see output like:
Vector Algorithms Vector data: 5 7 4 2 8 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 3 Value to insert: 42 Position to insert the value: 5 Vector data: 5 7 4 2 8 42 6 1 9 0 3 0. Exit program 1. Find item 2. Remove item 3. Insert new item Choice (0-3): 0 Goodbye!
Notice the element for the position (index) is now gone.
algorithms.cpp", and submit the file to Canvas with the rest of the exercise files for the week.When finished developing your code click here to verify. Code need not look exactly the same. After you have completed your own program, reviewing another is often helpful in learning how to improve your programming skills.
void print(int num); void print(double num); void print(string str);
print() functions above, the compiler calls the functions as follows:
int main() {
print(42); // first
print(42.0); // second
print('a'); // Which function does this call?
print("abc"); // third
return 0;
}
int print(int num); double print(int num);
#include <iostream>
using namespace std;
void print(int num);
void print(double num);
void print(string str);
int main() {
print(42); // first
print(42.0); // second
print('a'); // Which function does this call? Why?
print("abc"); // third
return 0;
}
void print(int num) {
cout << "int: " << num << endl;
}
void print(double num) {
cout << "double: " << num << endl;
}
void print(string str) {
cout << "string: " << str << endl;
}
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If so, list the CA numbers in Chat
In this exercise we code overloaded functions.
For this exercise we break into teams. Within the team, work with each other to develop a solution. When the team has finished, choose one member to show your solution to the class by sharing your screen. The instructor will ask one team to share their solution.
#include <iostream>
using namespace std;
// Prints a number and a string
void print(double num, string str);
// Prints a string and a number
void print(string str, double num);
int main() {
// Enter your function calls here
return 0;
}
// Define your functions here
You may choose how to define your functions as long as each one prints both parameter values.
main(), add a statement to call each of the functions you defined, using any number or string you prefer.overload.cpp", and submit the file to Canvas with the rest of the exercise files for the week.When finished developing your code click here to verify. Code need not look exactly the same. After you have completed your own program, reviewing another is often helpful in learning how to improve your programming skills.
#include, known as an include directive#include tells the preprocessor to replace that line by the contents of a given filename#include directive since we started:
#include <iostream>
#include "myfile.h"
.h suffix for any file that will be included in another fileh is short for header, to indicate that the file is intended to be included at the top (or header) of other filesmain() functionmain() function#include preprocessor directivemain() function from last weeks example squarelog program as shown below#include "squarelog.h"
squarelog.h#ifndef SQUARELOG_H #define SQUARELOG_H #include <iostream> using namespace std; const int ANSWER = 42; // Returns the square of a number double square(double number); // Displays a message to the console void log(string funName, double value); #endif
squarelog.cpp
#include <iostream>
#include "squarelog.h"
using namespace std;
int main() {
double number = 5;
log("main", number);
double result = square(5);
log("main", result);
return 0;
}
double square(double number) {
log("square", number);
double result = number * number;
log("square", result);
return result;
}
void log(string funName, double value) {
cout << "In " << funName << "() the value is ";
cout << value << endl;
}
#ifndef SQUARELOG_H #define SQUARELOG_H ... (function prototypes) #endif
ifndef fails and results in a blank file being includedIn this exercise we explore the use of separate compilation using include directives.
For this exercise we break into teams. Within the team, work with each other to develop a solution. When the team has finished, choose one member to show your solution to the class by sharing your screen. The instructor will ask one team to share their solution.
#include <iostream>
using namespace std;
void print(int num);
void print(double num);
void print(string str);
int main() {
print(42);
print(42.0);
print('a');
print("abc");
return 0;
}
void print(int num) {
cout << "int: " << num << endl;
}
void print(double num) {
cout << "double: " << num << endl;
}
void print(string str) {
cout << "string: " << str << endl;
}
int: 42 double: 42 int: 97 string: abc
print.h.
#ifndef PRINT_H #define PRINT_H ... (function prototypes) #endif
print.h.int: 42 double: 42 int: 97 string: abc
print.h and print.cpp. submit both files to Canvas with the rest of the exercise files for the week.When finished developing your code click here to verify. Code need not look exactly the same. After you have completed your own program, reviewing another is often helpful in learning how to improve your programming skills.
void myFunction() {
// statements of the function
}
void myFunction()
{
// statements of the function
}
'_'):
int MyFunction()
'_'):
int myFunction()
'_') as separators:
int my_function()
/** and end with */@param entry explains each parameter@return entry describes the return value
#include <iostream>
using namespace std;
/**
Returns the square of a number
@param number The number to square
@return the square of number
*/
double square(double number);
/**
Displays a message to the console
@param funName The name of the function
@param value The value to display
*/
void log(string funName, double value);
int main() {
double number = 5;
log("main", number);
double result = square(5);
log("main", result);
return 0;
}
double square(double number) {
log("square", number);
double result = number * number;
log("square", result);
return result;
}
void log(string funName, double value) {
cout << "In " << funName << "() the value is ";
cout << value << endl;
}
In this exercise we format your code to an acceptable style.
For this exercise we break into teams. Within the team, work with each other to develop a solution. When the team has finished, choose one member to show your solution to the class by sharing your screen. The instructor will ask one team to share their solution.
/**
CS-11 Asn 6: Calculates the area of a circle and the volume of a sphere.
@file sphere.cpp
@author Ed Parrish
@version 1.1 3/17/20
*/
#include <iostream>
#include <cmath>
using namespace std;
const double PI = 3.14159;
/**
Returns the area of a circle with the specified radius.
@param radius The radius of the circle.
@return The area of the circle.
*/
double area(double radius);
/**
Returns the volume of a sphere with the specified radius.
@param radius The radius of the circle.
@return The volume of the sphere.
*/
double volume(double radius);
// Controls operation of the program.
int main(void) {
double radius_of_both, area_of_circle, volume_of_sphere;
cout << "Enter a radius to use for both a circle\n"
<< "and a sphere (in inches): ";
cin >> radius_of_both;
area_of_circle = area(radius_of_both);
volume_of_sphere = volume(radius_of_both);
cout << "Radius = " << radius_of_both << " inches\n"
<< "Area of circle = " << area_of_circle
<< " square inches\n"
<< "Volume of sphere = " << volume_of_sphere
<< " cubic inches\n";
return 0;
}
// Returns the area of a circle with the specified radius.
double area(double radius) {
return (PI*pow(radius, 2));
}
// Returns the volume of a sphere with the specified radius.
double volume(double radius) {
return ((4.0/3.0)*PI *pow(radius,3));
}
formatted.cpp", and submit the file to Canvas with the rest of the exercise files for the week.When finished developing your code click here to verify. Code should quite similar to the example below, within the approved options.