Program will not allow for input even with 'cin <<'

[luckyniji13]

It allows you to type in your name but following that it goes all wonky. I know I don't have the percentage thing programmed correctly, working on that but even before I added math to it the two cins for numQuestions and numAnswers are not working. Any suggestions?

// Lab 3 percentage.cpp
// This program will determine the percentage 
// of answers a student got correct on a test.
// PUT YOUR NAME HERE.

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

int main()
{
   string name;
   int numQuestions,
       numCorrect,
	   studentName,
	   totalPoints;
   double percentage;
   
   // Get student's test data
   cout << "Enter student's first and last name: ";
   cin >> studentName;
   // WRITE A STATEMENT TO READ THE WHOLE NAME INTO THE name VARIABLE.
   
   cout << "Number of questions on the test: ";

   cin  >> numQuestions;

   cout << "\n";

   cout << "Number of answers the student got correct: ";

   cin  >> numCorrect;

   cout << "\n";
   
   // Compute and display the student's % correct
   totalPoints = numQuestions / 100;
	   percentage = totalPoints * numAnswers;

   // WRITE A STATEMENT TO COMPUTE THE % AND ASSIGN THE RESULT TO percentage.
   cout << studentName << " received a score of " << percentage << " on this test.\n";
   // WRITE STATEMENTS TO DISPLAY THE STUDENT'S NAME AND THEIR TEST 
   // PERCENTAGE WITH ONE DECIMAL POINT. 
   
   return 0;
}

Thank you. Total noob here.

[Chervil]

Is studentName really an integer?

Also, if you want to enter first and last names, you need either two separate variables, or use getline with one string to hold both names.

[luckyniji13]

I updated the code and it works now! I just have to fix the percentage problem.

 // Lab 3 percentage.cpp
// This program will determine the percentage 
// of answers a student got correct on a test.
// PUT YOUR NAME HERE.

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

int main()
{
   string firstName,
	      lastName;
   int numQuestions,
       numCorrect,
	   totalPoints;
   double percentage;
   
   // Get student's test data
   cout << "Enter student's first name: ";
   cin >> firstName;
   cout << "Enter student's last name: ";
   cin >> lastName;

   // WRITE A STATEMENT TO READ THE WHOLE NAME INTO THE name VARIABLE.
   
   cout << "\nNumber of questions on the test: ";

   cin  >> numQuestions;


   cout << "\nNumber of answers the student got correct: ";

   cin  >> numCorrect;
   
   // Compute and display the student's % correct
   totalPoints = numQuestions / 100;
	   percentage = totalPoints * numCorrect;

   // WRITE A STATEMENT TO COMPUTE THE % AND ASSIGN THE RESULT TO percentage.
   cout << "\n" << lastName << "," << firstName << " received a score of " << percentage << " on this test.\n";
   // WRITE STATEMENTS TO DISPLAY THE STUDENT'S NAME AND THEIR TEST 
   // PERCENTAGE WITH ONE DECIMAL POINT. 
   
   return 0;
}

[Chervil]

I'm not sure that your calculation of the percentage is using the correct method. I suggest you try it out with a piece of paper and a calculator and some actual numbers.

However - an important point, if you try to do a divide with two integers, the result will also be an integer. For example 22/7 results in 3. If you want a floating point result, you must make sure that at least one of the values is of type double (or float). For example 22/3.0 will result in 3.142857. If that result is then stored in a variable of type int, then the decimal part will be lost again.