Question

CT143 : Intro to C++ Lab 15: Array Practice Instructions Complete each of the C++ activities described below in a single source file Label each activity with its own heading using comments. Activities: 1) Favorite numbers a. Declare and initialize an array of 10 integers as a single statement using a name of your choice. b. Output the result of adding the 1st and 5th members of the array. C. Subtract the 4h member from 3 times the 10th member of the array and print the result. d. Create an if statement that compares the 6th and 8th members of the array and outputs to the console whichever number is bigger. 2) Days of the week a. Declare an array of 7 strings called weekdays. b. Initialize the array with the names of the days of the week. c. Output to the screen a statement which uses the 3rd member of the weekdays array to output the statement "The third day of the week is Wednesday" 3) Grades a. Declare and initialize with initial values of 0.0 an array of 5 decimals (type float) called grades. Note: To initialize an array with 0.0 for each value, simply assign a single 0.0 in curly braces on the right-hand side.

Answer 1

1. Favorite Numbers

#include <iostream>

using namespace std;

int main()
{
int count[10] = {1, 2, 3, 4,5,6,7,8,9,10};  // initialize the array with 10 integers
std::cout << count[0]+count[4] << std::endl; // accessing 1st element and 5th element and adding both
std::cout << (count[9]*3)-count[3] << std::endl; // multiplying 10th member 3 times and subtracting 4th member from it
if(count[5]>count[7]) // checking largest of the 6th and 8th member
{
std::cout << count[5] << std::endl;
}
else
{
std::cout << count[7] << std::endl;
}

return 0;
}

2. Days of the week

#include <iostream>
#include<string> // for string class

using namespace std;

int main()
{
string weekdays[10] = {"Monday","Tuesday","Wednesday","thursday","friday","saturday","sunday"}; // initialize the array with 7 strings ie weekdays
std::cout <<"The third day of the week is "<<weekdays[2]<< std::endl; // print the 3rd memeber of the weekdays array
return 0;
}
3. Grades

#include <iostream>
#include<string> // for string class

using namespace std;

int main()
{
float sum=0.0,average=0.0; // initialize the sum to add all the 5 grades and initialize average to find the average
float grades[5] = {0.0}; // initialize the array of 5 grades with value 0.0

  std::cout<<"enter 5 grades out of 100"<< std::endl;
for(int i =0;i<5;i++) // Loop for 5 times to input 5 grades into the grades array
{
std::cin >> grades[i];  // grade input from user
}
for(int i=0;i<5;i++) // Loop for 5 times to get the inputed grades
{
sum=sum+grades[i]; // add all the grades into the variable sum
}
average = sum/5; // divide the sum by total number of grades ie 5 to get the average
std::cout <<"The average is "<<average<< std::endl;

return 0;
}

4. Looping the week

#include <iostream>
#include<string> // for string class

using namespace std;

int main()
{
string weekdays[7] = {"Monday","Tuesday","Wednesday","thursday","friday","saturday","sunday"};// initialize the array with weeks
for(int i=0;i<7;i++) // Loop for 7 times to display the days
{
std::cout <<weekdays[i] << std::endl; display each day stored in the array
}
return 0;
}