Question

For this program you create a program with multiple functions using C++

1) You will need a function that creates an array of 100 random numbers that are generated between and including 20 and including 40. This must be a two dimensional array of 10 numbers in a row with a total of 10 rows.

2) A function that will store the array of random numbers in a data file called "rannum".

3) A function must then read the data file "rannum" and display the array.

4) A function that will take that array of random numbers and order the array from smallest to largest, repeated numbers are grouped together. The orered array is to be displayed as well.

5) A function that counts how many times each number was chosen and then displayed. As an example:

Number Qty

22 4

23 1

24 6

6) Display a graphical representation of the number of occurrences for each value. Should look like:

Number

20 xxx

21 xxxxxx

23 xxxx

24 xxxxxx

Answer 1

#include<bits/stdc++.h>
using namespace std;

void func1(int arr[10][10]){
   for(int i = 0; i < 10; ++i){
       for(int j = 0; j < 10; ++j){
           arr[i][j] = rand()%21 + 20;
       }  
   }
}

void func2(int arr[10][10]){
   ofstream myfile("rannum.txt");
   myfile.clear(); //clearing old content in file
   for(int i = 0; i < 10; ++i){
       for(int j = 0; j < 10; ++j){
           myfile << to_string(arr[i][j]);
           myfile << " ";
       }
       myfile << "\n";  
   }
   myfile.close();
}

void func3(){
   ifstream myfile("rannum.txt");
   string line;
   cout << "rannum array\n";
   if(myfile.is_open()){
           while(getline(myfile,line)){
                   cout << line << "\n";
           }
   }
   myfile.close();
}

void func4(int arr[10][10]){
   //Bubble sort to sort the 2D array
   for(int i = 0;i < 10 ;++i){
       for(int j = 0; j < 10 ;++j){
          
           int smallest = arr[i][j];
           int initial = j + 1;
           pair<int,int> p({i,j});
           for(int l = i; l < 10 ;++l){
               for(int m = initial; m < 10 ;++m){
                   if(arr[l][m] < smallest){
                       smallest = arr[l][m];
                       p = make_pair(l,m);
                   }
               }
               initial = 0;
           }
           swap(arr[i][j], arr[p.first][p.second]);
       }
   }
  
   //display
   cout << "Ordered array\n";
   for(int i = 0; i < 10; ++i){
       for(int j = 0; j < 10; ++j){
           cout << arr[i][j] << " ";
       }  
       cout << "\n";
   }
}

void func5(int arr[10][10], int freq[21]){
   //frequency of a random number calculation
   for(int i = 0; i < 10; ++i){
       for(int j = 0; j < 10; ++j){
           freq[arr[i][j] - 20] += 1;
       }  
   }
   //display
   cout << "Number Qty\n";
   for(int i = 0; i < 21; ++i){
       cout << i + 20 << " " << freq[i] << endl;
   }
}
void func6(int freq[21]){
   cout << "Number\n";
   for(int i = 0; i < 21; ++i){
       cout << i + 20 << " ";
       for(int j = 0; j < freq[i]; ++j){
           cout << "x";
       }
       cout << "\n";
   }
}

int main(){
   int arr[10][10];
   func1(arr); //array in cpp are passes by reference
   func2(arr); //write file
   func3(); // display file
   func4(arr);
   int frequency_array[21];
   func5(arr, frequency_array);
   func6(frequency_array);
   return 0;
  
}

SAMPLE OUTPUT: