LAB 5.3 Working with the for Loop Bring in program for.cpp from the Lab 5 folder (this is Sample Program 5.5 from the Pre-lab Reading Assignment). This program has the user input a number n and then finds the mean of the first n positive integers. The code is shown below: // This program has the user input a number n and then finds the // mean of the first n positive integers // PLACE YOUR NAME HERE #include using namespace std; int main() { int value; // value is some positive number n int total = 0; // total holds the sum of the first n positive numbers int number; // the amount of numbers float mean; // the average of the first n positive numbers cout << "Please enter a positive integer" << endl; cin >> value; if (value > 0) { for (number = 1; number <= value; number++) { total = total + number; }// curly braces are optional since there is only one statement mean = static_cast(total) / value; // note the use of the typecast // operator here cout << "The mean average of the first " << value << " positive integers is " << mean << endl; } else cout << "Invalid input - integer must be positive" << endl; return 0; } Exercise 1: Why is the typecast operator needed to compute the mean in the statement mean = static_cast(float)(total)/value;? What do you think will happen if it is removed? Modify the code and try it. Record what happens. Make sure that you try both even and odd cases. Now put static_cast total back in the program. Exercise 2: What happens if you enter a float such as 2.99 instead of an integer for value? Try it and record the results. Exercise 3: Modify the code so that it computes the mean of the consecutive positive integers n, n+1, n+2, . . . , m, where the user chooses n and m. For example, if the user picks 3 and 9, then the program should find the mean of 3, 4, 5, 6, 7, 8, and 9, which is 6.
Types of Loop
Loops are the elements of programming in which a part of code is repeated a particular number of times. Loop executes the series of statements many times till the conditional statement becomes false.
Loops
Any task which is repeated more than one time is called a loop. Basically, loops can be divided into three types as while, do-while and for loop. There are so many programming languages like C, C++, JAVA, PYTHON, and many more where looping statements can be used for repetitive execution.
While Loop
Loop is a feature in the programming language. It helps us to execute a set of instructions regularly. The block of code executes until some conditions provided within that Loop are true.
LAB 5.3 Working with the for Loop
Bring in
the Pre-lab Reading Assignment). This program has the user input a number n and
then finds the mean of the first n positive integers. The code is shown below:
// This program has the user input a number n and then finds the
// mean of the first n positive integers
// PLACE YOUR NAME HERE
#include <iostream>
using namespace std;
int main()
{
int value; // value is some positive number n
int total = 0; // total holds the sum of the first n positive numbers
int number; // the amount of numbers
float mean; // the average of the first n positive numbers
cout << "Please enter a positive integer" << endl;
cin >> value;
if (value > 0)
{
for (number = 1; number <= value; number++)
{
total = total + number;
}// curly braces are optional since there is only one statement
mean = static_cast<float>(total) / value; // note the use of the typecast
// operator here
cout << "The mean average of the first " << value
<< " positive integers is " << mean << endl;
}
else
cout << "Invalid input - integer must be positive" << endl;
return 0;
}
Exercise 1: Why is the typecast operator needed to compute the mean in the
statement mean = static_cast(float)(total)/value;? What do you think
will happen if it is removed? Modify the code and try it. Record what happens.
Make sure that you try both even and odd cases. Now put static_cast<float>
total back in the program.
Exercise 2: What happens if you enter a float such as 2.99 instead of an integer
for value? Try it and record the results.
Exercise 3: Modify the code so that it computes the mean of the consecutive
positive integers n, n+1, n+2, . . . , m, where the user chooses n and m.
For example, if the user picks 3 and 9, then the program should find the
mean of 3, 4, 5, 6, 7, 8, and 9, which is 6.
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