c++ BASIC

[runic wind]

can we do this ??

1.) int arr[20] = {};
i mean the array i said is of 20 int, but i made it empty

2.) int arr1[20];
int arr2[5] = {1,2,3,4,5}

arr1 = arr5;
will the arr1 get equal to 5?

3.) if i make a map and mapped the frequency of every integer

is there any command in c++ to know which has the highest frequency or i will have to loop over and do

int highest = INT_MIN;
while (it != map.end()) { 
if (it->second > highest) highest = it->second;
}

and now i will get the highest frequency integer stored in variable highest

[woven mirage]

Detected code, here are some useful tools:

<@&987246683568103514> please have a look, thanks.

[woven mirage]

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[past oxide]

I am pretty sure, the second one won't work

A correct way would be a for-loop for example. Something like:

int Ar1[5]={1,2,3,4,5};
int Ar2[20];
for(int i=0;i<4;i++){
Ar2[i]=Ar1[i];
}

so you gotta do it for each Array Index, one by one

there are some other ways tho.

[runic wind]

@atomic cobalt answer them whenever you get free 🙂

[formal cliff]

1.) the syntax = {}; means "initialize to default", so you will get an array containing 20 integers equal to zero
this works for other types too, e.g. int x = {}; is the same as int x = 0;, and if you have a class with a default constructor then Class x = {}; is the same as Class x = Class(); calling the default constructor

2.) you cannot do arr1 = arr2;, because arrays are not assignable. this gives a compile error "Array type int[5] is not assignable"

3.) in <algorithm> there is std::max_element:

int highest = std::max_element(
  map.begin(), map.end(), [] (auto p1, auto p2) {
    return p1.second < p2.second;
  })->second;

[woven mirage]

Detected code, here are some useful tools:

[runic wind]

if in 2.)
the array was assigned
can it then be equalized to other with other array which is of different size ?

[formal cliff]

you cannot assign arrays

initialization with an equals is fine

but once it has been declared you cannot assign an entire new array value

[runic wind]

like

int arr1[5] = {1,2,3,4,5}; 
int arr2[2] = {1,2}; 
arr1=arr2; 

is this calid ??

[woven mirage]

Detected code, here are some useful tools:

[formal cliff]

no it is not valid

you cannot assign arrays

arr1 = arr2; is never valid if arr1 is an array

[runic wind]

oh means if they are of equal size too, we can not do arr1=arr2

[formal cliff]

yes, if they are of equal size you still cannot do it