Average of 2d array

Question

I need to create an average of rows and columns of a 2d array with random numbers. I have created the nested for loop, but the output is 3 numbers like this -2.345e^4321(not the exact output, but the range is 0 -100 integers, so a double average shouldn't get this output.

I apologize, I was in another class. Here's code, even though I did work on it a bit, but now I get the averages in the range, but now I don't have random numbers:

#include <iostream>
#include <ctime>
#include <cstdlib>

using namespace std;

int main()
{
srand(time(NULL));
const int rows =3;
const int cols =3;
int ranInt[rows][cols];
int sum = 0;
double average =0;

for(int row = 0; row < rows; row++){
for(int col =0; col < cols; col++){
sum+= ranInt[rows][cols];
// cout << sum;
}
double average = sum/(cols*rows);
cout << "Average: " << average<<endl;
}

return 0;
}

Answer 1

for random numbers you need to use rand function
Here's a formula for it to generate random values in a range

int num = rand() % (maxVal - minVal + 1) + minVal

where maxVal and minVal are maximum and minimum values respectively

Answer 2

Please, can you show us your attempt !? 👍😉

Answer 3

#include <iostream>
#include <ctime>
#include <cstdlib>

using namespace std;

int main(){
const int rows = 3;
const int cols = 3;
int ranInt[rows][cols];
int sum = 0;

srand(time(NULL));
for(int row = 0; row < rows; row++){
for(int col = 0; col < cols; col++){
/* The array's elements are not yet assigned a value, if you print them on screen you'll see that they contain garbage values. Use rand() function to assign them random values, as it had been suggested earlier.
Use <row> & <col> to refer to an array element by index, these are the designated loop iterators, not <rows> and <cols> */
ranInt[row][col] = rand() % 101;
sum += ranInt[row][col];
}
}
/* Calculate the <average> here, outside the loops */
double average = sum / (cols * rows);
cout << "Average: " << average << endl;

return 0;
}

Hth, cmiiw

Answer 4

So you want to average all the values in the 2D array?

Hint: A 2D array is just a list (like a 1D array). 2 rows of four columns is just 8 elements.