CODEWITHSUNDEEP
c++visual-studio-2010
user3312523
user3312523

Reputation: 17

Confused on how to get out of infinite while loop with no sentinal value

I can only use a while Loop. I am to prompt the user for their first and last name and the number of exams taken. Then i am to use a while loop to sum and average the exams. Noting that each test score is a 100.

I am getting into an infinite loop, but i don't know what value would make this loop go into false besides 0.

Here is my Code:

#include <iostream>
#include <string>
#include <iomanip>


using namespace std;

int main()
{
string fname, lname;
int tests;
int test = 100;
double test_avg;

cout << "Please enter your first and last name." << endl;
cin >> fname >> lname;

cout << "Please enter the number of exams you have taken." << endl;
cin >> tests;

while( tests > 1 )
{
    test_avg = (test * tests) / tests;
    cout << setprecision(1) << showpoint << fixed;
    cout << fname << ' ' << lname << ' ' << test_avg << "%" << endl;
    tests = 0;

}

return 0;
}

Upvotes: 0

Views: 80

Answers (1)

Spock77
Spock77

Reputation: 3325

"...i am to use a while loop and average the exams"

If you do not ask a person about the score of each exam, the avg will always be 100, which I suppose is the maximum score.

For a loop, always ask yourself - when should the loop finish? I'd say, when a person will stop entering the results.

You can organise input as follows:

int scores=0;
int cnt = 0;
while (true) {
    cout << "Please enter the scores of the exams you have taken. (-1 to finish)" << endl;

    cin >> score;  // todo: check correctness - a number, 0 <= score <= 100, etc.
    if (score == -1) 
       break;
    cnt++;
    scores += score;
}

double test_avg = 0.0;
if (cnt > 0)
    test_avg = double(scores) / cnt;

Upvotes: 1

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