How does addition work for arrays?

Projects General Guidance
1

(First post here so I apologize in advanced if there's a formatting issue I missed when reading the rules)

Probably a lot simpler than I'm making this out to be. Its my understanding that you can add 2 integers, but I can't figure out how to add 2 arrays, or how to add an integer and an array.
ex1 (adding integers):

int a = 1;
int b = 2;

void setup(){
  Serial.begin (9600);
}
void loop() {
int answer = a + b;
Serial.print(answer);
}

This will compile.

ex2 (adding arrays):

int a[2] = {1,2};
int b[2] = {3.4};

void setup(){
  Serial.begin (9600);
}
void loop() {
int answer = a + b;
Serial.print(answer);
}

This gives me the following errors
" error: invalid operands of types 'int [2]' and 'int [2]' to binary 'operator+'

int answer = a + b;"

warning: narrowing conversion of '3.4000001e+0' from 'double' to 'int' inside { } [-Wnarrowing]

int b[2] = {3.4};

And lastly ex3 (adding an integer and an array):

int a = 1;
int b[2] = {2.3};

void setup(){
  Serial.begin (9600);
}
void loop() {
int answer = a + b;
Serial.print(answer);
}

This compiles, but still gives the errors
" warning: narrowing conversion of '2.29999995e+0' from 'double' to 'int' inside { } [-Wnarrowing]

int b[2] = {2.3};
and
warning: invalid conversion from 'int*' to 'int' [-fpermissive]

int answer = a + b;"

So if someone could help me understand what the computer is actually doing with these functions, I'd really appreciate it.
How I understood it, I thought adding integers would work like adding 2 constants, so it would compile (which it did).
I thought adding arrays would add each section to the matching section (ex: first int in array 1 is added to the first int in array 2, 7th int in array 1 is added to 7th int in array 2 etc.) which doesn't seem to be the case.
And finally, I thought adding an integer to an array would either A. Not work at all because its adding 1 number to 5, or B. it would add the integer individually to each value in the array (ex: if the integer was 1, and the array values were 1 and 2, it would return the values 2 and 3 for the array). Which also doesn't seem to be the case.

2

Why not ask the teaching staff?

It's what you're paying them for.

3

int b[2] you are defining an integer array.
3.4 is a floating point number :wink:

Hint
int a[2] = {1,2};
a[0] is 1
a[1] is 2

4

There is no shortcut for adding an integer to each element of an array:

int a = 1;

int b[2] = {2, 3};

void setup(){
  Serial.begin (9600);
}

void loop() {
    int answer[2];
    for (int i=0; i<2; i++)
    {
        answer[i] =  b[i] + a;
        Serial.print("answer[");
        Serial.print(i);
        Serial.print("] = ");
        Serial.println(answer[i]);
    }
}

And there is no shortcut for adding corresponding elements of two arrays:

int a[2] = {1,2};
int b[2] = {2, 3};

void setup(){
  Serial.begin (9600);
}

void loop() {
    int answer[2];
    for (int i=0; i<2; i++)
    {
        answer[i] =  b[i] + a[i];
        Serial.print("answer[");
        Serial.print(i);
        Serial.print("] = ");
        Serial.print(answer[i]);
    }
}