Write a program that outputs a histogram of grades for an assignment given to a

Question

Write a program that outputs a histogram of grades for an assignment given to a class of students. The program should input each student's grade as an integer and store the grade in a vector. Grades should be entered until the user enters -1 for a grade. The program should then scan through the vector and compute the histogram. In computing the histogram, the minimum value of a grade is 0, but your program should determine the maximum value entered by the user. Output the histogram to the console.

Explanation / Answer

#include <iostream>

#include <iomanip>

#include <vector>

using namespace std;

int main()

{

vector<int> scores;

int count[100]; // 0 to 100

int grade;

int maxScore = 0;

int i;

// read scores

do

{

cout << "Enter grade(-1 to quit): ";

cin >> grade;

if (grade >= 0)

scores.push_back(grade);

} while (grade >= 0);

for (i = 0; i < 100; i++)

count[i] = 0;

for (i = 0; i < (int)scores.size(); i++)

{

if (maxScore < scores[i])

maxScore = scores[i];

count[scores[i]]++;

}

// display the histogram

for (i = 0; i <= maxScore; i++)

{

cout << setw(2) << i << ": ";

for (int j = 0; j < count[i]; j++)

cout << "*";

cout << endl;

}

return 0;

}

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