Question

Write a C++ program that outputs a histogram of student Marks for a Mid-term-1 Examination. The program should input each student’s Marks as an integer and store the Marks in a dynamic array. Marks should be entered until the user enters -1 for marks. The program should then scan through the Dynamic array and compute the histogram. In computing the histogram, the minimum value of a marks is 0 but your program should determine the maximum value entered by the user. Then use a dynamic array to store and output the histogram. (20 points) For example, if the input is: 80 60 80 70 60 50 50 50 -1 Then the output should be: The frequency of 80's: 2 The frequency of 70's: 1 The frequency of 60's: 2 The frequency of 50's: 3

note: the arrays should be dynamic . furthermore the logic should not match other's logic, it should not be copy paste

Answer 1

#include <iostream>
#include <vector>
#include <bits/stdc++.h> 

using namespace std;

int main()
{
    ///Initilaze vector To get user input dynamically
    std::vector<int> myvector;
    
    //Getting User Inputs till user enters -1
    while (1) {
        int myint;
        std::cout << "Please enter some value (enter -1 to end):\n";
        std::cin >> myint;  
        if(myint == -1){
            break; 
        }
        myvector.push_back(myint);
    }
    
    //Getting the size of user Inputs
    int n = myvector.size();
    
    int i; 
  
    // Initialise a set 
    // to store the array values 
    set<int> s; 
  
    // Insert the array elements 
    // into the set 
    for (i = 0; i < n; i++) { 
  
        // insert into set 
        s.insert(myvector[i]); 
    } 
  
    set<int>::iterator it; 
  
    // Print the duplicates count 
    for (it = s.begin(); it != s.end(); ++it){ 
        int count = 0;
        for( i = 0; i < n;i++ ){
          if( myvector[i] == *it ){
            count++;  
          }  
        }
        cout << "The Frequency of " << *it <<"'s: " << count << "\n";
    }
    return 0;
}

Output: