How to calculate the sum in the matrix, diagonally, and everything below the diagonal (below it)

Question

Cod:

#include<iostream>
#include<stdlib.h>
#define n 3
#define m 3
using namespace std;
int main ()
{
int i,j;
int a[n][m],q,w;
for(i=0;i<n;i++)
for (j=0;j<m;j++)
a[i][j]=rand()%10;
for(i=0;i<n;i++)
{
for(j=0;j<m;j++)
cout<<a[i][j]<<" ";
cout<<endl;

}
for(i=0;i<n;i++)
{q=0;
for (j=0;j<m;j++)
if(i==j)

q=(i+j);
cout<<"Сума 1= "<<q<<"\n";
}

for(i=0;i<n;i++)
{w=0;
for (j=0;j<m;j++)
if(i<j)

w=(i+j);
cout<<"Сума 2 = "<<w<<"\n";
}
return 0;
}

Answer 1

Sin Cara M
I have modified the code to separate sum of diagonal elements with sum of elements under the diagonal.

Number of elements can be obtained just by multiplying <n> by <m> I guess ...

Answer 2

Ipang Well, the task was not said, so I think 70,50, 30 (and everything under it, ie 80,90,60)

Answer 3

Ipang Ok, thank you, if I know I will definitely say)

Answer 4

Ipang Here still the variant that 10,50,90 (and 40,70,80) can approach

Answer 5

Ipang Thank you very much, everything works😊

Answer 6

Thank you very, very much😊 Ipang

Answer 7

There should be a sum of 1 - 10,50,90, and the sum 2 - 40,70,90. And the number must be recorded Ipang

Answer 8

How do you say the number to count? What will it look like in the code? Ipang

Answer 9

Imagine we have this,

10 20 30
40 50 60
70 80 90

Which elements are you trying to sum?

I didn't understand "everything below the diagonal", using the above matrix, which elements are "below diagonal"?

Answer 10

Sin Cara M
I managed to work it out like this.
Can you please check it out ...

https://code.sololearn.com/cQc80Y1d30qj/?ref=app

Answer 11

idk, I don't do sum of cubes

Answer 12

Sin Cara M
I need time to think this through. Let me get back to you later. Ping me if you got a solution, I would like to learn too ...

Answer 13

You're welcome Sin Cara M 👌

Answer 14

And no it turned out you need to find the sum of the diagonal, ie it will be the sum of 1, and the sum of 2 will be what is under it, and still need the number of elements in the matrix (there will be 9) but how to write them😅😅 Ipang

Answer 15

I misunderstood the objective. I thought sum of 1 was

10
40 50
70 80 90

And sum of 2 was

30
50 60
70 80 90

Hahaha LMAO

Answer 16

Where it says

dia += a[i][j];

Or

under += a[i][j]

That are parts which decides whether an element lies on diagonal slot or underneath it. You can `cout a[i][j];` near those lines, to print the values Sin Cara M

Answer 17

You're welcome Sin Cara M 👌

Answer 18

#include