Adding together two arrays and print into third array

Question

Before I start I must notice that I am a begginer in C++. I have a code (see below), In this code I have two arrays with 10 random numbers but In tab_A numbers are the same like in tab_B - I don't know how to solve this. Also I don't know how to merge/add/sum these two arrays in new array tab_C and print result.

#include <iostream>
#include <cstdio>
#include <time.h>
#include <cstdlib>

using namespace std;

int gen() {
  return rand() % 11;
}
int main()
{
    
    int tab_A[10];
    cout<<"TABLICA A DEBUG"<<endl;
    srand (time(NULL));
    for (int i=0; i<10; i++)
    {
        tab_A[i] = gen();
        cout<<tab_A[i]<<endl;
    }
    
    int tab_B[10];
    cout<<"TABLICA B DEBUG"<<endl;
    srand (time(NULL));
    for (int i=0; i<10; i++)
    {
        tab_B[i] = gen();
        cout<<tab_B[i]<<endl;
    }
    
    int tab_C[10];
    cout<<"TABLICA C DEBUG"<<endl;
    
    int sumAB=0;
    sumAB=tab_A[10]+tab_B[10];
    
    tab_C[10]=sumAB;
    cout<<tab_C[10]<<endl;
    return 0;
}

Can you share an example as to how you want to add the two arrays? — ranka47
– ranka47, Commented Dec 7, 2020 at 19:09

ranka47 · Accepted Answer · 2020-12-07 16:16:35Z

2

In the code, you have called srand twice with the same seed. Hence, the numbers that will be randomly generated will be the same. If you want to generate random numbers it is advisable to set seed only once.

Also, there seems to be an issue in the code. C++ has 0-indexing. Hence, the lines

sumAB=tab_A[10]+tab_B[10];
tab_C[10]=sumAB;
cout<<tab_C[10]<<endl;

will give errors.

As the size of tab_C is 10 so the index of the last element would be 9.

answered Dec 7, 2020 at 16:16

ranka47

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3 Comments

Bazejoo Over a year ago

Okay srand solvet. Now I have problem with tab_C. As output I have "1". I changed that array size to 11

ranka47 Over a year ago

Do you want to add element by element?

Bazejoo Over a year ago

I want to perform the addition

int sumAB=0;     sumAB=tab_A[10]+tab_B[10];          for(int i=0; i<tab_C[10]; i++)     {         for(int i=0; i<tab_C[10]; i++)         {             tab_C[i]=sumAB;         }     }

this is my last code

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