Looping

In the Branching exercise, you had to run Program Grade five times in order to try the program with five different input values.

• Take Program Grade and enclose the body of the processing in a loop that executes 5 times. Use a while statement and a count-controlled loop. Compile the program until it compiles correctly.
• Run the program using the data from the Branching exercise. Were the results the same?
• Change the looping structure to an event-controlled loop in which a negative input value stops the process. Compile your program until it compiles correctly.
• Run the program using the same data. Were the results the same? What value did you use to end the process?

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A copy of Program Sum in file progL8.cpp is shown below.

 
// Program Shell1 prompts for and reads a one-digit number.
// Values between 0 and the digit (inclusive) are summed.
#include <iostream>
using namespace std;
int main ()
{
 int counter; // loop-control variable
 int sum; // running sum
 int digit;
 
 cout << "Enter a one-digit number; press return."
 << endl;
 cin >> digit;
 counter =  // Initialize counter 
 sum =  // Initialize sum 
 
 while // While expression 
 { 
 
 // Body of the loop 
 
 }
 cout << "Sum of digits between 0 and "
 << digit << " is " << sum << endl;
 return 0;
}

Read he program carefully and do the following tasks.

• Complete the statement on line 13 that initializes the counter.
• Complete in the statement on line 14 that initializes the sum.
• Complete the while expression.
• Complete the body of the loop.

Compile the program.

Run the program using 9 as the input value. What is printed?

Is the loop a count-controlled loop or an event-controlled loop?

In order to change the loop to the other type of loop, what would have to be changed?