# It's a C++ question!

Asked 1 weeks ago, Updated 1 weeks ago, 1 views

I'm a C++ beginner student.

I wrote a function that generates random numbers from 0 to 9, creating a two-dimensional array of four rows and three rows, and I want to express the frequency of the numbers in this array as a one-dimensional array.

Two zeros appear in a two-dimensional array, like increasing two zeros in a one-dimensional array!

``````#include <iostream>
#include <iomanip>   // setw()
#include <fstream>
#include <ctime>     // rand(), time()

using namespace std;

// Symbolic constants, global
const int ROW = 4;
const int COL = 3;

// *** Circular of function ***
void printArray (in num[][COL], in rowSize); // 2D array output
void randomNumbers (intinumbers[], rowSize); // initialize to random number
void randomCounts (intinumbers[], int size, intcounts[]); // frequency calculation
void printArray1 (int x[], int from, int to); // 1D array output

int main()   //main
{
int rn[ROW][COL];
int counts = {0, };

randomNumbers(rn, ROW);
printArray(rn, ROW);
randomCounts(rn, ROW, counts);

cout <<endl<< "frequency arrangement" <<endl;
printArray1(counts, 0, 9);

}   }   // main

// ******************* Function *********************

// 2D array output
void printArray(int num[][COL], int rowSize)
{
cout << "==================" << endl;
for (int row = 0; row < rowSize; row++)
{
for (int col = 0; col < COL; col++)
cout << setw(5) << num[row][col];
cout << endl;
}
cout << "==================" << endl;

}

void randomNumbers(int inumbers[][COL], int rowSize)
{
srand((unsigned int)time(NULL));

for (int i = 0; i < ROW; i++)
{
for (int j = 0; j < COL; j++)
{
inumbers[i][j] = rand() % 10;

}
}

}

void randomCounts(int inumbers[][COL], int size, int counts[])
{

for (int i = 0; i < ROW; i++)
{
for (int j = 0; j < COL; j++)
{
for (int s = 0; s < 12; s++)
{
if (counts[s] == inumbers[i][j])
counts[s]++;
}

}
}

}

void printArray1(int x[], int from, int to)
{
// Index Output
for (int i = from; i <= to; i++)
cout << setw(5) << i;
cout << endl;
cout << "  ";
// Separator output
for (int i = from; i <= to; i++)
cout << "----+";
cout << endl;
// Array Output
for (int i = from; i <= to; i++)
cout << setw(5) << x[i];
cout << endl << endl;
}

``````

The randomCounts function that calculates the frequency here is a problem. I'd really appreciate your help!

c++ 2d-array

2022-09-20 10:25

``````void randomCounts(int inumbers[][COL], int size, int counts[])
{

for (int i = 0; i < ROW; i++)
{
for (int j = 0; j < COL; j++)
{
counts[inumbers[i][j]]++;
}
}
}
``````

2022-09-20 10:25

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